fix: 修复 DOM 终端缩放后宽度恢复

[wosuxiongmao]

Change Scope

• Small Change: Fast feedback, localized UI/logic, low-risk.
• Large Change: Runtime-risk terminal renderer geometry/recovery behavior.

What Does This PR Do?

Fixes DOM terminal width recovery after resize/zoom while keeping PTY geometry ownership separate from renderer-local visual refresh.

• Keeps the DOM renderer measured-geometry calibration that prevents right-edge text overflow.
• Refreshes DOM renderer visual footprint after output/zoom without committing PTY geometry from renderer-only paths.
• Guards viewport zoom refresh so the initial mount does not force a local terminal fit/resize; real viewport zoom changes still force a renderer refresh.
• Makes the DOM right-edge E2E deterministic for the DOM renderer and robust against row selection/metric timing.
• Updates the delayed xterm reply recovery E2E to assert against the xterm transcript reader instead of DOM text, so it remains valid under canvas/WebGL rendering.

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Large Change Spec

1. Reference / Practice

Terminal geometry has two separate owners: PTY size is durable/runtime state, while renderer dimensions are visual state. The fix keeps those paths separate: visual refresh may repaint or sync DOM renderer dimensions, but PTY resize remains owned by explicit geometry commit paths.

2. Business Logic & Acceptance Criteria

• DOM terminal output stays away from the right clipping edge across canvas zoom.
• Initial terminal mount does not perform a forced local fit that can diverge from canonical PTY geometry.
• Actual viewport zoom changes still refresh terminal visuals.
• Restored agent terminals do not show delayed DSR replies like ^[[1;1R as visible output.

3. State Owners, Invariants, Risks

• PTY geometry is owned by terminal geometry commit/sync paths.
• Renderer-local refresh may call xterm refresh/DOM sync, but must not become the durable PTY authority.
• Viewport zoom state is owned by the canvas/effective DPR path; the terminal hook only reacts to real zoom changes.
• Main risk is regressions in terminal restore, zoom, DOM renderer clipping, and transcript-based E2E assertions.

4. Verification

• pnpm test -- --run tests/unit/contexts/terminalNode.appearance-sync.spec.tsx tests/unit/terminalNode/terminalGeometrySync.spec.ts tests/unit/terminalNode/terminalDomRendererGeometrySync.spec.ts tests/unit/terminalNode/terminalGeometrySync.domVisual.spec.ts tests/unit/terminalNode/terminalGeometrySync.initialGeometry.spec.ts tests/unit/terminalNode/terminalGeometrySync.domFit.spec.ts
• pnpm check
• pnpm test:e2e tests/e2e/recovery.agent-terminal-replies.spec.ts --project electron --reporter=line
• pnpm test:e2e tests/e2e/workspace-canvas.terminal-dom-right-edge.spec.ts --project electron --reporter=line
• pnpm line-check:staged
• pnpm pre-commit passed. Full E2E reported 9 first-run flaky timeouts, all passed on retry.

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Delivery & Compliance Checklist

• pnpm pre-commit passed.
• I have signed the CLA if required (see CLA.md).
• I have included tests to lock down the behavior.
• I have adhered to DEVELOPMENT.md architectural boundaries.
• I have attached a screenshot or screen recording (if this touches the UI).
• I have updated documentation/PR notes where behavior or verification changed.

Screenshots / Visual Evidence

No screenshot attached. Covered by automated E2E: workspace-canvas.terminal-dom-right-edge.spec.ts and recovery.agent-terminal-replies.spec.ts.