diff --git a/package-lock.json b/package-lock.json
index 5a075ca..3df7381 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,9 +8,13 @@
       "name": "agent-system-frontend",
       "version": "0.1.0",
       "dependencies": {
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+        "mammoth": "^1.13.0",
         "marked": "^15.0.7",
+        "pptx-preview": "^1.0.7",
         "react": "^19.2.0",
-        "react-dom": "^19.2.0"
+        "react-dom": "^19.2.0",
+        "xlsx": "^0.18.5"
       },
       "devDependencies": {
         "@types/react": "^19.2.0",
@@ -1442,6 +1446,33 @@
         "url": "https://opencollective.com/vitest"
       }
     },
+    "node_modules/@xmldom/xmldom": {
+      "version": "0.8.15",
+      "resolved": "https://registry.npmjs.org/@xmldom/xmldom/-/xmldom-0.8.15.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
+    "node_modules/adler-32": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/adler-32/-/adler-32-1.3.1.tgz",
+      "integrity": "sha512-ynZ4w/nUUv5rrsR8UUGoe1VC9hZj6V5hU9Qw1HlMDJGEJw5S7TfTErWTjMys6M7vr0YWcPqs3qAr4ss0nDfP+A==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=0.8"
+      }
+    },
+    "node_modules/argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
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+      "license": "MIT",
+      "dependencies": {
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+      }
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@@ -1452,6 +1483,26 @@
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+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
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+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
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       "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.11.26.tgz",
@@ -1520,6 +1571,19 @@
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       "license": "CC-BY-4.0"
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+    "node_modules/cfb": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/cfb/-/cfb-1.2.2.tgz",
+      "integrity": "sha512-KfdUZsSOw19/ObEWasvBP/Ac4reZvAGauZhs6S/gqNhXhI7cKwvlH7ulj+dOEYnca4bm4SGo8C1bTAQvnTjgQA==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "adler-32": "~1.3.0",
+        "crc-32": "~1.2.0"
+      },
+      "engines": {
+        "node": ">=0.8"
+      }
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       "resolved": "https://registry.npmjs.org/chai/-/chai-6.2.2.tgz",
@@ -1530,6 +1594,15 @@
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+    "node_modules/codepage": {
+      "version": "1.15.0",
+      "resolved": "https://registry.npmjs.org/codepage/-/codepage-1.15.0.tgz",
+      "integrity": "sha512-3g6NUTPd/YtuuGrhMnOMRjFc+LJw/bnMp3+0r/Wcz3IXUuCosKRJvMphm5+Q+bvTVGcJJuRvVLuYba+WojaFaA==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=0.8"
+      }
+    },
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       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-2.0.0.tgz",
@@ -1537,6 +1610,24 @@
       "dev": true,
       "license": "MIT"
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+    "node_modules/core-util-is": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.3.tgz",
+      "integrity": "sha512-ZQBvi1DcpJ4GDqanjucZ2Hj3wEO5pZDS89BWbkcrvdxksJorwUDDZamX9ldFkp9aw2lmBDLgkObEA4DWNJ9FYQ==",
+      "license": "MIT"
+    },
+    "node_modules/crc-32": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/crc-32/-/crc-32-1.2.2.tgz",
+      "integrity": "sha512-ROmzCKrTnOwybPcJApAA6WBWij23HVfGVNKqqrZpuyZOHqK2CwHSvpGuyt/UNNvaIjEd8X5IFGp4Mh+Ie1IHJQ==",
+      "license": "Apache-2.0",
+      "bin": {
+        "crc32": "bin/crc32.njs"
+      },
+      "engines": {
+        "node": ">=0.8"
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@@ -1562,6 +1653,37 @@
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+    "node_modules/dingbat-to-unicode": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/dingbat-to-unicode/-/dingbat-to-unicode-1.0.2.tgz",
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+      "license": "BSD-2-Clause"
+    },
+    "node_modules/duck": {
+      "version": "0.1.12",
+      "resolved": "https://registry.npmjs.org/duck/-/duck-0.1.12.tgz",
+      "integrity": "sha512-wkctla1O6VfP89gQ+J/yDesM0S7B7XLXjKGzXxMDVFg7uEn706niAtyYovKbyq1oT9YwDcly721/iUWoc8MVRg==",
+      "license": "BSD",
+      "dependencies": {
+        "underscore": "^1.13.1"
+      }
+    },
+    "node_modules/echarts": {
+      "version": "5.6.0",
+      "resolved": "https://registry.npmjs.org/echarts/-/echarts-5.6.0.tgz",
+      "integrity": "sha512-oTbVTsXfKuEhxftHqL5xprgLoc0k7uScAwtryCgWF6hPYFLRwOUHiFmHGCBKP5NPFNkDVopOieyUqYGH8Fa3kA==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "tslib": "2.3.0",
+        "zrender": "5.6.1"
+      }
+    },
+    "node_modules/echarts/node_modules/tslib": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.3.0.tgz",
+      "integrity": "sha512-N82ooyxVNm6h1riLCoyS9e3fuJ3AMG2zIZs2Gd1ATcSFjSA23Q0fzjjZeh0jbJvWVDZ0cJT8yaNNaaXHzueNjg==",
+      "license": "0BSD"
+    },
     "node_modules/electron-to-chromium": {
       "version": "1.5.440",
       "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.5.440.tgz",
@@ -1666,6 +1788,15 @@
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+    "node_modules/frac": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/frac/-/frac-1.1.2.tgz",
+      "integrity": "sha512-w/XBfkibaTl3YDqASwfDUqkna4Z2p9cFSr1aHDt0WoMTECnRfBOv2WArlZILlqgWlmdIlALXGpM2AOhEk5W3IA==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=0.8"
+      }
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@@ -1691,6 +1822,24 @@
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+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/immediate/-/immediate-3.0.6.tgz",
+      "integrity": "sha512-XXOFtyqDjNDAQxVfYxuF7g9Il/IbWmmlQg2MYKOH8ExIT1qg6xc4zyS3HaEEATgs1btfzxq15ciUiY7gjSXRGQ==",
+      "license": "MIT"
+    },
+    "node_modules/inherits": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+      "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+      "license": "ISC"
+    },
+    "node_modules/isarray": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
+      "integrity": "sha512-VLghIWNM6ELQzo7zwmcg0NmTVyWKYjvIeM83yjp0wRDTmUnrM678fQbcKBo6n2CJEF0szoG//ytg+TKla89ALQ==",
+      "license": "MIT"
+    },
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       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@@ -1724,6 +1873,44 @@
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+    "node_modules/jszip": {
+      "version": "3.10.2",
+      "resolved": "https://registry.npmjs.org/jszip/-/jszip-3.10.2.tgz",
+      "integrity": "sha512-3l+rb15IOWtUhU0H5MFqES/T6Kh7abYwjosBey/vD6hDt8zoEffkSC5Ws5SGtgVw3gBx2NEbhTeSW1+kWkpyTQ==",
+      "license": "(MIT OR GPL-3.0-or-later)",
+      "dependencies": {
+        "lie": "~3.3.0",
+        "pako": "~1.0.2",
+        "readable-stream": "~2.3.6",
+        "setimmediate": "^1.0.5"
+      }
+    },
+    "node_modules/lie": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/lie/-/lie-3.3.0.tgz",
+      "integrity": "sha512-UaiMJzeWRlEujzAuw5LokY1L5ecNQYZKfmyZ9L7wDHb/p5etKaxXhohBcrw0EYby+G/NA52vRSN4N39dxHAIwQ==",
+      "license": "MIT",
+      "dependencies": {
+        "immediate": "~3.0.5"
+      }
+    },
+    "node_modules/lodash": {
+      "version": "4.18.1",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.18.1.tgz",
+      "integrity": "sha512-dMInicTPVE8d1e5otfwmmjlxkZoUpiVLwyeTdUsi/Caj/gfzzblBcCE5sRHV/AsjuCmxWrte2TNGSYuCeCq+0Q==",
+      "license": "MIT"
+    },
+    "node_modules/lop": {
+      "version": "0.4.2",
+      "resolved": "https://registry.npmjs.org/lop/-/lop-0.4.2.tgz",
+      "integrity": "sha512-RefILVDQ4DKoRZsJ4Pj22TxE3omDO47yFpkIBoDKzkqPRISs5U1cnAdg/5583YPkWPaLIYHOKRMQSvjFsO26cw==",
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "duck": "^0.1.12",
+        "option": "~0.2.1",
+        "underscore": "^1.13.1"
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@@ -1744,6 +1931,28 @@
         "@jridgewell/sourcemap-codec": "^1.5.5"
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+    "node_modules/mammoth": {
+      "version": "1.13.0",
+      "resolved": "https://registry.npmjs.org/mammoth/-/mammoth-1.13.0.tgz",
+      "integrity": "sha512-2cawcYFcP7ISfXbBcL9lmVgTNWo88v/52ND1gnywHtVT/pX0//puPnf0iMPV9ZgmuvNOE+zkIhDgZ9M2c2dDDg==",
+      "license": "BSD-2-Clause",
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+        "@xmldom/xmldom": "^0.8.6",
+        "argparse": "~1.0.3",
+        "base64-js": "^1.5.1",
+        "dingbat-to-unicode": "^1.0.1",
+        "jszip": "^3.7.1",
+        "lop": "^0.4.2",
+        "underscore": "^1.13.1",
+        "xmlbuilder": "^10.0.0"
+      },
+      "bin": {
+        "mammoth": "bin/mammoth"
+      },
+      "engines": {
+        "node": ">=12.0.0"
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       "version": "15.0.12",
       "resolved": "https://registry.npmjs.org/marked/-/marked-15.0.12.tgz",
@@ -1806,6 +2015,18 @@
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+    "node_modules/option": {
+      "version": "0.2.4",
+      "resolved": "https://registry.npmjs.org/option/-/option-0.2.4.tgz",
+      "integrity": "sha512-pkEqbDyl8ou5cpq+VsnQbe/WlEy5qS7xPzMS1U55OCG9KPvwFD46zDbxQIj3egJSFc3D+XhYOPUzz49zQAVy7A==",
+      "license": "BSD-2-Clause"
+    },
+    "node_modules/pako": {
+      "version": "1.0.11",
+      "resolved": "https://registry.npmjs.org/pako/-/pako-1.0.11.tgz",
+      "integrity": "sha512-4hLB8Py4zZce5s4yd9XzopqwVv/yGNhV1Bl8NTmCq1763HeK2+EwVTv+leGeL13Dnh2wfbqowVPXCIO0z4taYw==",
+      "license": "(MIT AND Zlib)"
+    },
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@@ -1862,6 +2083,25 @@
         "node": "^10 || ^12 || >=14"
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+    "node_modules/pptx-preview": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/pptx-preview/-/pptx-preview-1.0.7.tgz",
+      "integrity": "sha512-YByocJuyxAR4YB4Q3+VAxdLfEvA5LojG1gAJsx2Mw0QU5FJPps/2fkJOupJ6oBbA+KdWRpuAk6G6T34rKCHVxw==",
+      "license": "ISC",
+      "dependencies": {
+        "echarts": "^5.5.1",
+        "jszip": "^3.10.1",
+        "lodash": "^4.17.21",
+        "tslib": "^2.7.0",
+        "uuid": "^10.0.0"
+      }
+    },
+    "node_modules/process-nextick-args": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
+      "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag==",
+      "license": "MIT"
+    },
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       "version": "19.3.0",
       "resolved": "https://registry.npmjs.org/react/-/react-19.3.0.tgz",
@@ -1893,6 +2133,21 @@
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+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.8.tgz",
+      "integrity": "sha512-8p0AUk4XODgIewSi0l8Epjs+EVnWiK7NoDIEGU0HhE7+ZyY8D1IMY7odu5lRrFXGg71L15KG8QrPmum45RTtdA==",
+      "license": "MIT",
+      "dependencies": {
+        "core-util-is": "~1.0.0",
+        "inherits": "~2.0.3",
+        "isarray": "~1.0.0",
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+        "safe-buffer": "~5.1.1",
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@@ -1939,6 +2194,12 @@
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+      "license": "MIT"
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@@ -1955,6 +2216,12 @@
         "semver": "bin/semver.js"
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+      "resolved": "https://registry.npmjs.org/setimmediate/-/setimmediate-1.0.5.tgz",
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+      "license": "MIT"
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@@ -1972,6 +2239,24 @@
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+      "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
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+      "license": "BSD-3-Clause"
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+      "resolved": "https://registry.npmjs.org/ssf/-/ssf-0.11.2.tgz",
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+      "license": "Apache-2.0",
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@@ -1986,6 +2271,15 @@
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       "license": "MIT"
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+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
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+      "license": "MIT",
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@@ -2030,6 +2324,12 @@
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+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
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+      "license": "0BSD"
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@@ -2044,6 +2344,12 @@
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+    "node_modules/underscore": {
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+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.13.8.tgz",
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+      "license": "MIT"
+    },
     "node_modules/update-browserslist-db": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.3.3.tgz",
@@ -2075,6 +2381,26 @@
         "browserslist": ">= 4.21.0"
       }
     },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "license": "MIT"
+    },
+    "node_modules/uuid": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-10.0.0.tgz",
+      "integrity": "sha512-8XkAphELsDnEGrDxUOHB3RGvXz6TeuYSGEZBOjtTtPm2lwhGBjLgOzLHB63IUWfBpNucQjND6d3AOudO+H3RWQ==",
+      "deprecated": "uuid@10 and below is no longer supported.  For ESM codebases, update to uuid@latest.  For CommonJS codebases, use uuid@11 (but be aware this version will likely be deprecated in 2028).",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist/bin/uuid"
+      }
+    },
     "node_modules/vite": {
       "version": "6.4.3",
       "resolved": "https://registry.npmjs.org/vite/-/vite-6.4.3.tgz",
@@ -2257,12 +2583,75 @@
         "node": ">=8"
       }
     },
+    "node_modules/wmf": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wmf/-/wmf-1.0.2.tgz",
+      "integrity": "sha512-/p9K7bEh0Dj6WbXg4JG0xvLQmIadrner1bi45VMJTfnbVHsc7yIajZyoSoK60/dtVBs12Fm6WkUI5/3WAVsNMw==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=0.8"
+      }
+    },
+    "node_modules/word": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/word/-/word-0.3.0.tgz",
+      "integrity": "sha512-OELeY0Q61OXpdUfTp+oweA/vtLVg5VDOXh+3he3PNzLGG/y0oylSOC1xRVj0+l4vQ3tj/bB1HVHv1ocXkQceFA==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=0.8"
+      }
+    },
+    "node_modules/xlsx": {
+      "version": "0.18.5",
+      "resolved": "https://registry.npmjs.org/xlsx/-/xlsx-0.18.5.tgz",
+      "integrity": "sha512-dmg3LCjBPHZnQp5/F/+nnTa+miPJxUXB6vtk42YjBBKayDNagxGEeIdWApkYPOf3Z3pm3k62Knjzp7lMeTEtFQ==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "adler-32": "~1.3.0",
+        "cfb": "~1.2.1",
+        "codepage": "~1.15.0",
+        "crc-32": "~1.2.1",
+        "ssf": "~0.11.2",
+        "wmf": "~1.0.1",
+        "word": "~0.3.0"
+      },
+      "bin": {
+        "xlsx": "bin/xlsx.njs"
+      },
+      "engines": {
+        "node": ">=0.8"
+      }
+    },
+    "node_modules/xmlbuilder": {
+      "version": "10.1.1",
+      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-10.1.1.tgz",
+      "integrity": "sha512-OyzrcFLL/nb6fMGHbiRDuPup9ljBycsdCypwuyg5AAHvyWzGfChJpCXMG88AGTIMFhGZ9RccFN1e6lhg3hkwKg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=4.0"
+      }
+    },
     "node_modules/yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
       "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
       "dev": true,
       "license": "ISC"
+    },
+    "node_modules/zrender": {
+      "version": "5.6.1",
+      "resolved": "https://registry.npmjs.org/zrender/-/zrender-5.6.1.tgz",
+      "integrity": "sha512-OFXkDJKcrlx5su2XbzJvj/34Q3m6PvyCZkVPHGYpcCJ52ek4U/ymZyfuV1nKE23AyBJ51E/6Yr0mhZ7xGTO4ag==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "tslib": "2.3.0"
+      }
+    },
+    "node_modules/zrender/node_modules/tslib": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.3.0.tgz",
+      "integrity": "sha512-N82ooyxVNm6h1riLCoyS9e3fuJ3AMG2zIZs2Gd1ATcSFjSA23Q0fzjjZeh0jbJvWVDZ0cJT8yaNNaaXHzueNjg==",
+      "license": "0BSD"
     }
   }
 }
diff --git a/package.json b/package.json
index 06771af..5b01060 100644
--- a/package.json
+++ b/package.json
@@ -10,9 +10,13 @@
     "preview": "vite preview"
   },
   "dependencies": {
+    "jszip": "^3.10.2",
+    "mammoth": "^1.13.0",
     "marked": "^15.0.7",
+    "pptx-preview": "^1.0.7",
     "react": "^19.2.0",
-    "react-dom": "^19.2.0"
+    "react-dom": "^19.2.0",
+    "xlsx": "^0.18.5"
   },
   "devDependencies": {
     "@types/react": "^19.2.0",
diff --git a/src/components/Conversation.tsx b/src/components/Conversation.tsx
index 263aca7..26da6ec 100644
--- a/src/components/Conversation.tsx
+++ b/src/components/Conversation.tsx
@@ -45,6 +45,8 @@ function PartView({ part, live }: { part: Part; live?: boolean | null }) {
           <button className="ac-main" title={`打开 ${name}`} onClick={() => { if (art) store.viewArtifact(art) }}>
             <Icon name={icon} size={14} /> {name}
           </button>
+          <button className="ac-act" title={`右栏预览 ${name}（边聊边看）`}
+            onClick={() => { if (art) store.railPreview(art) }}><Icon name="panel-left" size={13} /></button>
           <a className="ac-act" title={`下载 ${name}`} href={api.artifactDownloadUrl(a?.artifactId ?? '')}
             download={name} onClick={e => e.stopPropagation()}><Icon name="download" size={13} /></a>
         </span>
diff --git a/src/components/DocViewer.tsx b/src/components/DocViewer.tsx
index c0d231b..c164b0f 100644
--- a/src/components/DocViewer.tsx
+++ b/src/components/DocViewer.tsx
@@ -1,26 +1,33 @@
-// 文档查看器（4.4 → 工作区文件管理升级）：单层 OverlayHost——markdown 渲染 /
-// 文本编辑保存 / 图片与 pdf 预览 / csv·json 等宽 / 二进制信息卡 + 下载。
+// 文档查看器（4.4 → 预览能力收敛）：格式渲染统一交给 @ui FilePreview
+// （md/图片/pdf/代码/数据/docx/xlsx/pptx/URL 一套分派），这里只保留 OverlayHost
+// 容器、工具栏与文本族的在线编辑保存。
 import { useEffect, useState } from 'react'
-import { marked } from 'marked'
 import { api } from '../api'
 import { store } from '../store'
-import { OverlayHost, Icon, Btn, EmptyState } from '@ui'
+import { OverlayHost, Icon, Btn, FilePreview } from '@ui'
 import type { Artifact } from '../contracts'
-import { artifactIcon, humanSize } from '../messageparts'
+import { humanSize } from '../messageparts'
 
 export function DocViewer({ artifact }: { artifact: Artifact }) {
   const [content, setContent] = useState<string | null>(null)
   const [editing, setEditing] = useState(false)
   const [dirty, setDirty] = useState(false)
 
+  const textKind = isTextKind(artifact)
   useEffect(() => {
-    if (artifact.kind === 'image' || isBinaryKind(artifact)) return
+    if (!textKind) return
+    setContent(null)
     fetch(api.artifactContentUrl(artifact.id)).then(r => r.text()).then(setContent).catch(() => setContent('（读取失败）'))
   }, [artifact.id])
 
-  const isPdf = /\.pdf$/i.test(artifact.name)
-  const isCsv = /\.csv$/i.test(artifact.name)
-  const isJson = /\.json$/i.test(artifact.name)
+  const source = {
+    kind: 'artifact' as const,
+    id: artifact.id,
+    name: artifact.name,
+    mime: artifact.mime,
+    contentUrl: api.artifactContentUrl(artifact.id),
+    downloadUrl: api.artifactDownloadUrl(artifact.id),
+  }
 
   return (
     <OverlayHost title={artifact.name} icon="📄" onClose={() => store.viewArtifact(null)}>
@@ -29,7 +36,7 @@ export function DocViewer({ artifact }: { artifact: Artifact }) {
           <span className="docv-meta">{artifact.kind}{humanSize(artifact.size) ? ` · ${humanSize(artifact.size)}` : ''}</span>
           <span className="spacer" />
           {dirty && <span className="docv-dirty">未保存</span>}
-          {isTextKind(artifact) && (
+          {textKind && (
             <>
               <Btn variant="ghost" icon={editing ? 'eye' : 'list'} onClick={() => setEditing(e => !e)}>{editing ? '预览' : '编辑'}</Btn>
               {editing && <Btn variant="primary" icon="check" disabled={!dirty} onClick={async () => {
@@ -44,25 +51,11 @@ export function DocViewer({ artifact }: { artifact: Artifact }) {
           </a>
         </div>
         <div className="docv-body">
-          {artifact.kind === 'image' ? (
-            <img src={api.artifactContentUrl(artifact.id)} alt={artifact.name} style={{ maxWidth: '100%', borderRadius: 8 }} />
-          ) : isPdf ? (
-            <iframe src={api.artifactContentUrl(artifact.id)} title={artifact.name} className="docv-pdf" />
-          ) : isBinaryKind(artifact) ? (
-            <EmptyState icon={artifactIcon(artifact.name, artifact.kind)}>
-              <b>{artifact.name}</b>
-              <div>{humanSize(artifact.size) || '二进制文件'} · 浏览器不支持此格式的在线预览</div>
-              <a className="btn v-primary" href={api.artifactDownloadUrl(artifact.id)} download={artifact.name}>
-                <Icon name="download" size={14} /> 下载文件
-              </a>
-            </EmptyState>
-          ) : editing ? (
+          {editing && textKind ? (
             <textarea className="search-input docv-editor" value={content ?? ''}
               onChange={e => { setContent(e.target.value); setDirty(true) }} />
-          ) : isCsv || isJson ? (
-            <pre className="docv-pre">{content ?? '（加载中…'}</pre>
           ) : (
-            <div className="doc-viewer" dangerouslySetInnerHTML={{ __html: marked.parse(content ?? '（加载中…') as string }} />
+            <FilePreview source={source} />
           )}
         </div>
       </div>
@@ -73,7 +66,3 @@ export function DocViewer({ artifact }: { artifact: Artifact }) {
 function isTextKind(a: Artifact): boolean {
   return a.kind === 'document' && /\.(md|txt|csv|log|json)$/i.test(a.name)
 }
-
-function isBinaryKind(a: Artifact): boolean {
-  return /\.(docx|pdf|xlsx|pptx|doc|xls|ppt|zip|png|jpg|jpeg|gif|webp)$/i.test(a.name)
-}
diff --git a/src/components/Workbench.tsx b/src/components/Workbench.tsx
index bf3ab1d..2cb8c41 100644
--- a/src/components/Workbench.tsx
+++ b/src/components/Workbench.tsx
@@ -1,9 +1,10 @@
-// 右栏终态（提案 T4/D25）：纯收件箱 + 「当前任务」常驻卡（计划/待办并入；工件/代理/
-// 插件面板迁为工作区弹层，见 Workspaces.tsx）。
+// 右栏终态（提案 T4/D25 → 预览双落位）：收件箱/预览两页签 + 「当前任务」常驻卡。
+// 预览页签（裁定 D4）承载右栏轻预览：FilePreview compact 模式，边聊边看。
 import { store, useStore } from '../store'
 import type { Run } from '../contracts'
-import { InboxList, pendingCount, type ActivityCard, type DocBridge } from '@ui'
+import { InboxList, pendingCount, FilePreview, type ActivityCard, type DocBridge } from '@ui'
 import { Icon } from '@ui'
+import { api } from '../api'
 
 // 工件解析/打开注入：渲染器纯展示，doc-ref 词汇经此桥接本仓状态（D29）。
 export const docBridge: DocBridge = {
@@ -19,23 +20,55 @@ export function Workbench() {
   const plan = useStore(s => s.plan)
   const todos = useStore(s => s.todos)
   const pending = pendingCount(cards)
+  const rightTab = useStore(s => s.ui.rightTab)
+  const railId = useStore(s => s.ui.railPreviewId)
+  const railArtifact = useStore(s => (railId ? s.artifacts.find(a => a.id === railId) : undefined))
 
+  const showPreview = rightTab === 'preview'
   return (
     <>
       <div className="tabs">
-        <span className="tab active">收件箱{pending > 0 ? ` ${pending}` : ''}</span>
+        <button className={`tab ${!showPreview ? 'active' : ''}`} onClick={() => store.setUI({ rightTab: 'inbox' })}
+          title="收件箱">收件箱{pending > 0 ? ` ${pending}` : ''}</button>
+        <button className={`tab ${showPreview ? 'active' : ''}`} onClick={() => store.railPreview(railArtifact ?? null)}
+          title="预览（右栏轻预览）"><Icon name="eye" size={13} /> 预览</button>
+        <span className="spacer" style={{ flex: 1 }} />
         <button className="tab tab-action" title="收纳已完成卡（done→关闭；已确认卡留痕不动）" onClick={() => store.tidyCards()}><Icon name="check" size={13} /> 收纳</button>
         <button className="tab" title="收起收件箱" onClick={store.toggleRight}><Icon name="chevron-right" size={14} /></button>
       </div>
-      <div className="tab-body">
-        <CurrentTaskCard plan={plan} todos={todos} />
-        <InboxList cards={cards} docBridge={docBridge} callbacks={{
-          onAction: (c: ActivityCard, id: string) => store.cardAction(c, id),
-          onPin: (c: ActivityCard, p: boolean) => store.cardPin(c, p),
-          onDismiss: (c: ActivityCard) => store.cardDismiss(c),
-          onLocate: (c: ActivityCard) => store.locateMessage(c.anchorMessageId),
-        }} />
-      </div>
+      {showPreview ? (
+        <div className="tab-body" data-rail-preview="">
+          {railArtifact ? (
+            <>
+              <div className="rail-preview-head">
+                <span className="rp-name" title={railArtifact.name}>{railArtifact.name}</span>
+                <span className="spacer" style={{ flex: 1 }} />
+                <button className="icon-btn" title="深预览（弹窗）" onClick={() => store.viewArtifact(railArtifact)}><Icon name="panel-left" size={14} /></button>
+                <a className="icon-btn" title="下载" href={api.artifactDownloadUrl(railArtifact.id)} download={railArtifact.name}><Icon name="download" size={14} /></a>
+                <button className="icon-btn" title="关闭预览" onClick={() => store.railPreview(null)}><Icon name="x" size={14} /></button>
+              </div>
+              <FilePreview compact source={{
+                kind: 'artifact',
+                id: railArtifact.id,
+                name: railArtifact.name,
+                mime: railArtifact.mime,
+                contentUrl: api.artifactContentUrl(railArtifact.id),
+                downloadUrl: api.artifactDownloadUrl(railArtifact.id),
+              }} />
+            </>
+          ) : <div className="empty-note" style={{ padding: 14 }}>在消息工件卡片或工件面板点「右栏预览」——文件会在这里边聊边看（md/图片/pdf/Office/代码均可）</div>}
+        </div>
+      ) : (
+        <div className="tab-body">
+          <CurrentTaskCard plan={plan} todos={todos} />
+          <InboxList cards={cards} docBridge={docBridge} callbacks={{
+            onAction: (c: ActivityCard, id: string) => store.cardAction(c, id),
+            onPin: (c: ActivityCard, p: boolean) => store.cardPin(c, p),
+            onDismiss: (c: ActivityCard) => store.cardDismiss(c),
+            onLocate: (c: ActivityCard) => store.locateMessage(c.anchorMessageId),
+          }} />
+        </div>
+      )}
     </>
   )
 }
diff --git a/src/components/Workspaces.tsx b/src/components/Workspaces.tsx
index efc359e..a06a605 100644
--- a/src/components/Workspaces.tsx
+++ b/src/components/Workspaces.tsx
@@ -2,7 +2,7 @@
 // ⌘1–9 快捷键与左栏快捷区共享同一清单（workspaceEntries）。
 import { useState } from 'react'
 import { store, useStore } from '../store'
-import type { Run, Artifact } from '../contracts'
+import type { Run } from '../contracts'
 import { api } from '../api'
 import { OverlayHost, Icon, type DocBridge } from '@ui'
 import { docBridge } from './Workbench'
@@ -55,26 +55,18 @@ export function Workspaces() {
   return null
 }
 
-/** 工件面板（工作区文件管理）：搜索 + kind 过滤 + 上传；行内预览/下载/删除（带确认）。 */
+/** 工件面板（工作区文件管理）：搜索 + kind 过滤 + 上传；行内 深预览/右栏预览/下载。
+ *  删除是保留能力：DELETE /api/artifacts/{id} 与 api.deleteArtifact 均在（插件可用），
+ *  系统默认不提供删除入口（提案 2026-09-30-file-preview-and-reserved-capabilities §2.2）。 */
 export function ArtifactsPanel() {
   const artifacts = useStore(s => s.artifacts)
   const [q, setQ] = useState('')
   const [kind, setKind] = useState<'all' | 'document' | 'data' | 'image'>('all')
-  const [confirmDel, setConfirmDel] = useState<string | null>(null)
 
   const kinds = ['all', 'document', 'data', 'image'] as const
   const visible = artifacts.filter(a =>
     (kind === 'all' || a.kind === kind) && a.name.toLowerCase().includes(q.toLowerCase()))
 
-  const del = async (a: Artifact) => {
-    try {
-      await api.deleteArtifact(a.id)
-      if (store.getState().ui.viewingArtifact?.id === a.id) store.viewArtifact(null)
-      store.toast(`已删除 ${a.name}`)
-    } catch (e) { store.toast(`删除失败：${e}`) }
-    if (store.getState().currentProjectId) store.refreshArtifacts(store.getState().currentProjectId!)
-  }
-
   return (
     <div className="artifacts-panel">
       <div className="ap-toolbar">
@@ -93,7 +85,7 @@ export function ArtifactsPanel() {
         </label>
       </div>
       {artifacts.length === 0
-        ? <div className="empty-note">暂无文件——上传附件或让模型产出文档（mock：#doc）；这里可浏览、预览、下载与删除</div>
+        ? <div className="empty-note">暂无文件——上传附件或让模型产出文档（mock：#doc）；这里可浏览、预览、下载</div>
         : visible.length === 0
           ? <div className="empty-note">没有匹配「{q}」的文件</div>
           : visible.map(a => (
@@ -104,12 +96,10 @@ export function ArtifactsPanel() {
                 <span className="meta">{a.kind} · {humanSize(a.size) || '—'} · {shortTime(a.updatedAt)}</span>
               </span>
               <span className="ar-acts">
-                <button className="icon-btn" title="预览" onClick={() => store.viewArtifact(a)}><Icon name="eye" size={14} /></button>
+                <button className="icon-btn" title="预览（弹窗）" onClick={() => store.viewArtifact(a)}><Icon name="eye" size={14} /></button>
+                <button className="icon-btn" title="右栏预览（边聊边看）" onClick={() => store.railPreview(a)}><Icon name="panel-left" size={14} /></button>
                 <a className="icon-btn" title="下载" href={api.artifactDownloadUrl(a.id)} download={a.name}
                   onClick={e => e.stopPropagation()}><Icon name="download" size={14} /></a>
-                {confirmDel === a.id
-                  ? <button className="icon-btn danger" title="确认删除" onClick={() => { setConfirmDel(null); del(a) }}><Icon name="check" size={14} /></button>
-                  : <button className="icon-btn" title="删除" onClick={() => { setConfirmDel(a.id); setTimeout(() => setConfirmDel(c => c === a.id ? null : c), 2500) }}><Icon name="trash" size={14} /></button>}
               </span>
             </div>
           ))}
diff --git a/src/main.tsx b/src/main.tsx
index 238076b..54e8577 100644
--- a/src/main.tsx
+++ b/src/main.tsx
@@ -1,10 +1,14 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
 import { App } from './App'
+import { wirePreviewCapabilities } from './previewsetup'
 import '@ui/tokens.css'
 import '@ui/ui.css'
 import './styles.css'
 
+// 预览能力装配（D1–D4）：Office 解析器与链接预览 fetcher 注入 @ui（动态加载，不进主包）。
+wirePreviewCapabilities()
+
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
     <App />
diff --git a/src/previewsetup.ts b/src/previewsetup.ts
new file mode 100644
index 0000000..b236bc3
--- /dev/null
+++ b/src/previewsetup.ts
@@ -0,0 +1,85 @@
+// 预览能力装配（裁定 D1–D4）：把重解析器经 configureFilePreviewLoaders 注入 @ui。
+// 全部 dynamic import——对应格式首次预览时才下载 chunk，主 bundle 不含解析器。
+// 链接预览 fetcher 走服务端 /api/url-preview（SSRF 防护在服务端执行端）。
+import { configureFilePreviewLoaders, configureLinkPreviewFetcher } from '@ui'
+import { auth } from './auth'
+import type { LinkPreviewData } from '@ui'
+
+const fetchBuf = async (url: string | undefined): Promise<ArrayBuffer> => {
+  const r = await fetch(url!)
+  if (!r.ok) throw new Error(`HTTP ${r.status}`)
+  return r.arrayBuffer()
+}
+
+const docxLoader = async (el: HTMLElement, source: { contentUrl?: string }) => {
+  const mammoth = await import('mammoth')
+  const { value } = await mammoth.convertToHtml({ arrayBuffer: await fetchBuf(source.contentUrl) })
+  el.innerHTML = value
+}
+
+const xlsxLoader = async (el: HTMLElement, source: { contentUrl?: string }) => {
+  const XLSX = await import('xlsx')
+  const wb = XLSX.read(await fetchBuf(source.contentUrl), { type: 'array' })
+  el.innerHTML = ''
+  const tabs = document.createElement('div')
+  tabs.className = 'ui-fp-sheet-tabs'
+  const wrap = document.createElement('div')
+  wrap.className = 'ui-fp-sheet-wrap'
+  el.append(tabs, wrap)
+  wb.SheetNames.forEach((name, i) => {
+    const tab = document.createElement('button')
+    tab.className = `ui-fp-sheet-tab ${i === 0 ? 'on' : ''}`
+    tab.textContent = name
+    tab.onclick = () => {
+      tabs.querySelectorAll('.ui-fp-sheet-tab').forEach(t => t.classList.remove('on'))
+      tab.classList.add('on')
+      renderSheet(wrap, XLSX.utils.sheet_to_json<unknown[]>(wb.Sheets[name], { header: 1, defval: '' }))
+    }
+    tabs.append(tab)
+    if (i === 0) renderSheet(wrap, XLSX.utils.sheet_to_json<unknown[]>(wb.Sheets[name], { header: 1, defval: '' }))
+  })
+}
+
+function renderSheet(wrap: HTMLElement, rows: unknown[][]) {
+  wrap.innerHTML = ''
+  if (rows.length > 200) {
+    const note = document.createElement('div')
+    note.className = 'ui-fp-note'
+    note.textContent = `仅显示前 200 行（共 ${rows.length} 行）——完整内容请下载`
+    wrap.append(note)
+  }
+  const table = document.createElement('table')
+  table.className = 'ui-fp-sheet'
+  for (const row of rows.slice(0, 200)) {
+    const tr = document.createElement('tr')
+    for (const cell of row) {
+      const td = document.createElement('td')
+      td.textContent = cell == null ? '' : String(cell)
+      td.title = td.textContent
+      tr.append(td)
+    }
+    table.append(tr)
+  }
+  wrap.append(table)
+}
+
+const pptxLoader = async (el: HTMLElement, source: { contentUrl?: string }) => {
+  // pptx2html@0.3.4 的 module 入口引用了大小写错配的 ./txml（Linux 打包必炸），
+  // 按 D2 备选条款改用 pptx-preview（init(dom).preview(arrayBuffer) 全保真渲染）。
+  const { init } = await import('pptx-preview')
+  el.innerHTML = ''
+  const stage = document.createElement('div')
+  stage.className = 'ui-fp-slide-stage'
+  el.append(stage)
+  const previewer = init(stage, { width: stage.clientWidth || 900 })
+  await previewer.preview(await fetchBuf(source.contentUrl))
+}
+
+export function wirePreviewCapabilities() {
+  configureFilePreviewLoaders({ docx: docxLoader, xlsx: xlsxLoader, pptx: pptxLoader })
+  configureLinkPreviewFetcher(async href => {
+    const r = await fetch(auth.withKey(`/api/url-preview?url=${encodeURIComponent(href)}`))
+    if (!r.ok) return { url: href, error: `HTTP ${r.status}` }
+    return (await r.json()) as LinkPreviewData
+  })
+}
diff --git a/src/store.ts b/src/store.ts
index 885fb39..960b8b0 100644
--- a/src/store.ts
+++ b/src/store.ts
@@ -35,6 +35,8 @@ export interface UIState {
   settingsOpen: boolean
   trackerRunId: string | null
   viewingArtifact: Artifact | null
+  /** 右栏轻预览的工件（rail 预览页签内容；与弹窗深预览 viewingArtifact 并存）。 */
+  railPreviewId: string | null
   activeWorkspace: string | null
   taskOrg: 'project' | 'timeline'
   showArchived: boolean
@@ -83,6 +85,7 @@ const DEFAULT_UI: UIState = {
   settingsOpen: false,
   trackerRunId: null,
   viewingArtifact: null,
+  railPreviewId: null,
   taskOrg: 'project',
   showArchived: false,
   lastProjectId: null,
@@ -512,6 +515,11 @@ export const store = {
   },
   openTracker(runId: string) { setUI({ trackerRunId: runId }) },
   viewArtifact(a: Artifact | null) { setUI({ viewingArtifact: a }) },
+  /** 右栏轻预览：打开指定工件并切到 rail 预览页签（双落位中的"轻"侧）。 */
+  railPreview(a: Artifact | null) {
+    if (!a) { setUI({ railPreviewId: null, rightTab: 'inbox' }); return }
+    setUI({ railPreviewId: a.id, rightTab: 'preview', rightCollapsed: false })
+  },
   openSettings(open: boolean) { setUI({ settingsOpen: open }) },
   openProjectSettings(id: string | null) { setUI({ projectSettingsId: id }) },
   toast(msg: string) {
diff --git a/src/styles.css b/src/styles.css
index 900b4d0..ce2270a 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -397,3 +397,10 @@ button { font-family: inherit; font-size: inherit; color: inherit; }
 .role-mark.role-assistant { background: none; border: none; padding: 0; }
 .msg.user .msg-role { align-items: center; }
 .ad-user-cell { display: flex; align-items: center; gap: 8px; }
+
+/* ---- 右栏轻预览（裁定 D4：右栏 + 弹窗双落位）---- */
+.rail-preview-head { display: flex; align-items: center; gap: 6px; padding: 0 2px 8px; border-bottom: 1px solid var(--border-soft); margin-bottom: 8px; }
+.rail-preview-head .rp-name { font-size: 13px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 55%; }
+.tab-body[data-rail-preview] { display: flex; flex-direction: column; }
+.tab-body[data-rail-preview] .ui-fp { flex: 1; }
+.artifact-chip .ac-act { border: none; background: none; }
diff --git a/tsconfig.tsbuildinfo b/tsconfig.tsbuildinfo
index 70fbd13..7eda14f 100644
--- a/tsconfig.tsbuildinfo
+++ b/tsconfig.tsbuildinfo
@@ -1 +1 @@
-{"root":["./src/App.tsx","./src/api.ts","./src/auth.ts","./src/contracts.ts","./src/live.ts","./src/main.tsx","./src/messageparts.ts","./src/passwords.ts","./src/store.ts","./src/tasklist.ts","./src/components/AdminUsersModal.tsx","./src/components/AgentTracker.tsx","./src/components/Conversation.tsx","./src/components/DocViewer.tsx","./src/components/LoginPage.tsx","./src/components/ProjectSettingsModal.tsx","./src/components/SettingsModal.tsx","./src/components/TaskSidebar.tsx","./src/components/Workbench.tsx","./src/components/Workspaces.tsx","./test/auth.test.ts","./test/contracts.test.ts","./test/live.test.ts","./test/messageparts.test.ts","./test/tasklist.test.ts"],"version":"5.9.3"}
\ No newline at end of file
+{"root":["./src/App.tsx","./src/api.ts","./src/auth.ts","./src/contracts.ts","./src/live.ts","./src/main.tsx","./src/messageparts.ts","./src/passwords.ts","./src/previewsetup.ts","./src/store.ts","./src/tasklist.ts","./src/components/AdminUsersModal.tsx","./src/components/AgentTracker.tsx","./src/components/Conversation.tsx","./src/components/DocViewer.tsx","./src/components/LoginPage.tsx","./src/components/ProjectSettingsModal.tsx","./src/components/SettingsModal.tsx","./src/components/TaskSidebar.tsx","./src/components/Workbench.tsx","./src/components/Workspaces.tsx","./test/auth.test.ts","./test/contracts.test.ts","./test/live.test.ts","./test/messageparts.test.ts","./test/tasklist.test.ts"],"version":"5.9.3"}
\ No newline at end of file