[DeliciousBuding]

Two helpers existed in several platform copies, and one of the copies had drifted:

• errorMessage — three definitions: web/src/platform/webWorkbenchError.ts (exported, 5 importers), a second copy inline in web/src/App.tsx, and a third in desktop/src/platform/useDesktopWorkbenchModel.ts. The App.tsx copy dropped the typeof error === 'string' branch, so a thrown string surfaced as the generic fallback while the same error on other paths showed its text.
• eventRunId — byte-identical copy of the exported @shared/transcript/edgeEventEvidence version in desktop/src/platform/useDesktopEdgeEvents.ts.

What changed

• shared/src/errors.ts now owns errorMessage next to AppError / parseError, with the union semantics (Error.message, non-blank thrown string, fallback) and unit tests for all three branches.
• webWorkbenchError.ts is deleted; its five importers (and App.tsx) import from @shared/errors. The two web test cases that only exercised the helper moved into shared/src/errors.test.ts, so coverage is unchanged, not dropped.
• Desktop and web both import the shared definition; the desktop eventRunId copy is replaced by the shared export.

Behaviour note: web/App.tsx now shows a thrown string's text instead of the fallback. That is the inconsistency being fixed, and the shared test pins it.

Verified

• pnpm --filter agenthub-web typecheck, pnpm --filter agenthub-desktop typecheck: pass.
• vitest run shared/src/errors.test.ts web/src/platform: 14 files / 161 tests pass; vitest run desktop/src/platform: 7 files / 64 tests pass.
• pnpm --filter agenthub-web lint (--max-warnings 0): pass. Desktop/shared lint: 0 errors (pre-existing warnings unchanged).
• rg webWorkbenchError over the repo: no hits.

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