fix(canvas): cap video duration choices

.project-docs/30-worklog/tasks/20260818-video-duration-client-a7c42f.md

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+# Task: Fix AI design video duration selector
+
+## Identity
+
+- Task ID: 20260818-video-duration-client-a7c42f
+- Mode: Feature
+- Branch: main
+- Worktree: D:\Datas\OthersProjects\makelore
+- Base commit: 9e1e03f58312dcdff53f520be7247c9921ec288b
+- Owner: codex-video-duration-client
+- Status: Ready for integration
+
+## Scope
+
+- Audit and fix the AI Design video confirmation duration selector in `src/pages/ImageCanvas/index.tsx`.
+- Defensively expose only enabled server-provided duration options from 2 through 6 seconds, including when an older server Quote still selects or advertises 7-15 seconds.
+- Verify that selecting 6 seconds survives Quote repricing and is sent by both the Quote PATCH and final confirmation request.
+- Add focused Renderer regression coverage in `tests/unit/image-canvas-page.test.tsx` and verify the existing Main-to-Works snake-case request mapping in `tests/unit/works-square-design-workspace.test.ts`.
+
+## Intent And Constraints
+
+- Own only `src/pages/ImageCanvas/index.tsx`, `tests/unit/image-canvas-page.test.tsx`, `tests/unit/works-square-design-workspace.test.ts`, and this task record.
+- Preserve Conversation-owned Quote state, server-authoritative repricing, and existing request field naming across Renderer and Main.
+- Do not modify the Works Square server, Electron Main routes/adapters, unrelated AI Design interactions, or files owned by peer tasks.
+- Keep invalid legacy selected durations visibly unselected until the user chooses an allowed value; do not silently submit a replacement duration without a fresh server Quote.
+
+## Outcome
+
+- The confirmation card now filters enabled server-provided video durations to the inclusive 2-6 second client boundary.
+- A legacy Quote whose selected duration is outside that boundary renders an explicit disabled `请选择时长` placeholder instead of visually selecting one allowed value while retaining a different hidden draft value.
+- Selecting 6 seconds updates the controlled draft, survives the debounced server re-quote, and is used by final confirmation.
+- Existing request seams were verified: Renderer sends `durationSeconds: 6`, and the Main cloud adapter sends `duration_seconds: 6` to Works Square.
+
+## Verification
+
+- Red test: the new legacy-duration regression initially failed because the native select visually resolved the unmatched controlled value `10` to option `2`.
+- `corepack pnpm exec vitest run tests/unit/image-canvas-page.test.tsx -t "limits legacy video durations"` — passed after the fix (1 passed, 46 skipped).
+- `corepack pnpm exec vitest run tests/unit/image-canvas-page.test.tsx tests/unit/image-workspace-api.test.ts tests/unit/works-square-design-workspace.test.ts` — passed (3 files, 92 tests).
+- `corepack pnpm run typecheck` — passed.
+- `corepack pnpm exec eslint src/pages/ImageCanvas/index.tsx tests/unit/image-canvas-page.test.tsx tests/unit/works-square-design-workspace.test.ts` — passed with no output.
+- `corepack pnpm run build:vite` — passed for Renderer, Electron Main, and Preload; only the existing dynamic-import and chunk-size warnings were reported.
+- `git diff --check` — passed; Git reported only the repository's LF-to-CRLF checkout warning.
+
+## Follow-ups
+
+- Production acceptance still requires a real server Quote containing the supported duration options; the client intentionally does not synthesize missing 2-6 second choices.
+
+## Promotion Candidates
+
+- Target: `.project-docs/40-domain/business-rules.md` during Integration Gate.
+  - Proposal: record that the AI Design client displays only enabled server-provided video duration options in the inclusive 2-6 second range; legacy selected values outside the range require an explicit allowed selection and fresh server Quote before confirmation.
+  - Evidence: focused controlled-select regression, Quote PATCH assertion, confirmation assertion, and Main-to-Works `duration_seconds: 6` contract test.
+  - Future impact: prevents older server configuration from re-exposing unsupported long video durations or silently submitting a hidden value different from the visible selection.
+  - Semantic conflicts: none; server pricing and option authority remain unchanged.
+  - Human confirmation required: no.