feat(desktop): add project git status

.qwen/e2e-tests/electron-desktop/project-git-status.md

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+# Electron Desktop E2E Record: Project Registry and Git Status
+
+Date: 2026-04-25
+
+## Slice
+
+Slice 9: Project Registry and Git Status.
+
+## User-Visible Scenario
+
+1. Launch the desktop app with a temporary HOME/QWEN_RUNTIME_DIR and fake ACP.
+2. Open a temporary Git workspace through the desktop Open Project flow.
+3. Verify the project appears in the left Projects list.
+4. Verify the top bar and right Review panel show Git branch/status counts.
+5. Create a new local thread and verify session listing is scoped to the active
+   project path.
+6. Refresh Git status after adding staged, modified, and untracked files.
+
+## Assertions
+
+- First screen is not black and contains `Qwen Code`, `Open Project`, `Review`,
+  and `Settings`.
+- Local service status is `Connected`.
+- Recent project row shows the selected project name and Git branch label.
+- Top bar shows a branch label or `No Git branch`.
+- Review panel shows Modified, Staged, and Untracked counts.
+- Network requests to `/api/projects`, `/api/projects/open`, and
+  `/api/projects/:id/git/status` succeed with bearer auth.
+- Renderer console has no uncaught exceptions.
+
+## Diagnostics on Failure
+
+- Save renderer screenshot.
+- Save renderer console errors and failed network requests.
+- Save Electron main stdout/stderr.
+- Save the temporary desktop project store JSON.
+- Save `git -C <workspace> status --porcelain=v1 --branch` output.
+
+## Automated Coverage Added This Iteration
+
+The full Playwright Electron harness is still pending. This iteration added
+server-level coverage in `packages/desktop/src/server/index.test.ts`:
+
+- opens a temporary Git project through `/api/projects/open`;
+- persists it to a desktop project store;
+- verifies `/api/projects` returns the recent project;
+- verifies `/api/projects/:id/git/status` returns staged, modified, and
+  untracked counts;
+- verifies invalid project paths return a typed `project_path_invalid` error.
+
+## Execution Results
+
+- `npm run test --workspace=packages/desktop` passed: 7 files, 45 tests.
+- `npm run typecheck --workspace=packages/desktop` passed.
+- `npm run lint --workspace=packages/desktop` passed.
+- `npm run build --workspace=packages/desktop` passed.
+
+## Remaining Risk
+
+This slice does not yet verify the real Electron renderer with screenshot/CDP.
+Slice 13 must convert the scenario above into repeatable Playwright Electron
+coverage and collect the diagnostics listed here.