Merge IAM U3 account UI history onto Frontend main
Why: PR #86 predates IAM U4 and the account-chain UI on main; the U3 behaviour was ported onto main by agent-exec transportsd47c493,72c941candafd9e75, so this merge only records the U3 branch history. Evidence: tree equals afd9e75; host tsc -b, vitest 565 passed, build and knip on72c941c(SELF); independent review blocking item fixed inafd9e75. Impact: no tree change versusafd9e75. Refs: Frontend PR #86, base main1650b4f
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