feat(mcp): use per-context dashboard for browser_annotate

[Skn0tt]

Summary

• browser_annotate no longer spawns the singleton dashboard daemon; instead each MCP context lazily opens its own dashboard window via Context.ensureDashboard().
• MCP owns the dashboard lifecycle: it closes when the context disposes or the client disconnects.
• Modal dashboard shows all registry sessions (workspace-grouped in the UI), so IdentitySessionProvider is gone.
• Builds on top of #459fb7b6 (openDashboardForContext → renamed openDashboard()).

Pushing to CI for early feedback — opening as draft.

[Skn0tt]

Found a good reason against modal dashboard: It goes against server mode, and we already have reports from people that care about that. microsoft/playwright-cli#325

[github-actions]

Test results for "MCP"

14 failed
❌ [firefox] › mcp/annotate.spec.ts:253 › should enter annotate mode on fresh dashboard.tsx mount with -s --annotate @mcp-windows-latest-firefox
❌ [firefox] › mcp/cli-devtools.spec.ts:217 › video-start-stop @mcp-windows-latest-firefox
❌ [firefox] › mcp/cli-devtools.spec.ts:231 › video-chapter @mcp-windows-latest-firefox
❌ [firefox] › mcp/cli-session.spec.ts:70 › delete-data @mcp-windows-latest-firefox
❌ [firefox] › mcp/cli-session.spec.ts:162 › list --all lists sessions from all workspaces @mcp-windows-latest-firefox
❌ [firefox] › mcp/dashboard.spec.ts:123 › daemon show: closing page exits the process @mcp-windows-latest-firefox
❌ [firefox] › mcp/dashboard.spec.ts:159 › save recording streams WebM bytes to the chosen file @mcp-windows-latest-firefox
❌ [firefox] › mcp/tracing.spec.ts:54 › check that trace is saved with browser_start_tracing (no output dir) @mcp-windows-latest-firefox
❌ [msedge] › mcp/annotate.spec.ts:231 › should start dashboard and annotate when no dashboard is running @mcp-windows-latest-msedge
❌ [msedge] › mcp/annotate.spec.ts:253 › should enter annotate mode on fresh dashboard.tsx mount with -s --annotate @mcp-windows-latest-msedge
❌ [msedge] › mcp/annotate.spec.ts:277 › should annotate via direct browser_annotate MCP call @mcp-windows-latest-msedge
❌ [msedge] › mcp/test-run.spec.ts:126 › test_run should stop when aborted @mcp-windows-latest-msedge
❌ [webkit] › mcp/config.ini.spec.ts:57 › ini config sets browser launch options @mcp-windows-latest-webkit
❌ [webkit] › mcp/config.spec.ts:138 › browser_get_config returns merged config from file, env and cli @mcp-windows-latest-webkit

6962 passed, 1058 skipped

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Merge workflow run.