chore(dashboard): remove browser_pick_locator remnants

[Skn0tt]

Summary

• Remove the browser_pick_locator MCP tool and its test
• Remove the BrowserContext.pickLocator event end-to-end (protocol, server/client, dispatcher, recorder emit, docs)
• Remove dead pickLocator/elementPicked plumbing from the dashboard (controller, channel, frontend, icon)
• Page.pickLocator() / Page.cancelPickLocator() public API is preserved

[github-actions]

Test results for "MCP"

35 failed
❌ [firefox] › mcp/dashboard.spec.ts:312 › should disengage annotate mode when --annotate client disconnects @mcp-windows-latest
❌ [firefox] › mcp/dashboard.spec.ts:394 › stop recording streams WebM bytes to the chosen file @mcp-windows-latest
❌ [webkit] › mcp/cli-devtools.spec.ts:141 › video-start-stop @mcp-windows-latest
❌ [webkit] › mcp/cli-devtools.spec.ts:155 › video-chapter @mcp-windows-latest
❌ [webkit] › mcp/dashboard.spec.ts:121 › daemon show: closing page exits the process @mcp-windows-latest
❌ [webkit] › mcp/dashboard.spec.ts:161 › should capture annotations via show --annotate @mcp-windows-latest
❌ [webkit] › mcp/dashboard.spec.ts:182 › should start dashboard and annotate when no dashboard is running @mcp-windows-latest
❌ [webkit] › mcp/dashboard.spec.ts:204 › should keep CLI annotate engaged across mode switches @mcp-windows-latest
❌ [webkit] › mcp/dashboard.spec.ts:237 › should enter annotate mode on fresh dashboard.tsx mount with -s --annotate @mcp-windows-latest
❌ [webkit] › mcp/dashboard.spec.ts:262 › should switch screencast to -s session on show --annotate @mcp-windows-latest
❌ [webkit] › mcp/dashboard.spec.ts:312 › should disengage annotate mode when --annotate client disconnects @mcp-windows-latest
❌ [webkit] › mcp/dashboard.spec.ts:394 › stop recording streams WebM bytes to the chosen file @mcp-windows-latest
❌ [msedge] › mcp/cli-core.spec.ts:31 › close @mcp-windows-latest
❌ [msedge] › mcp/cli-devtools.spec.ts:141 › video-start-stop @mcp-windows-latest
❌ [msedge] › mcp/cli-devtools.spec.ts:155 › video-chapter @mcp-windows-latest
❌ [msedge] › mcp/cli-json.spec.ts:171 › close after open returns closed status @mcp-windows-latest
❌ [msedge] › mcp/cli-json.spec.ts:177 › close-all after open returns closed sessions @mcp-windows-latest
❌ [msedge] › mcp/cli-session.spec.ts:50 › close @mcp-windows-latest
❌ [msedge] › mcp/cli-session.spec.ts:60 › close named session @mcp-windows-latest
❌ [msedge] › mcp/cli-session.spec.ts:72 › persistent session shows in list after close @mcp-windows-latest
❌ [msedge] › mcp/cli-session.spec.ts:85 › close-all @mcp-windows-latest
❌ [msedge] › mcp/cli-session.spec.ts:99 › delete-data @mcp-windows-latest
❌ [msedge] › mcp/cli-session.spec.ts:111 › delete-data named session @mcp-windows-latest
❌ [msedge] › mcp/cli-session.spec.ts:128 › session stops when browser exits @mcp-windows-latest
❌ [msedge] › mcp/cli-session.spec.ts:142 › session reopen with different config @mcp-windows-latest
❌ [msedge] › mcp/cli-session.spec.ts:159 › workspace isolation - sessions in different workspaces are isolated @mcp-windows-latest
❌ [msedge] › mcp/cli-session.spec.ts:191 › list --all lists sessions from all workspaces @mcp-windows-latest
❌ [msedge] › mcp/dashboard.spec.ts:121 › daemon show: closing page exits the process @mcp-windows-latest
❌ [msedge] › mcp/dashboard.spec.ts:161 › should capture annotations via show --annotate @mcp-windows-latest
❌ [msedge] › mcp/dashboard.spec.ts:182 › should start dashboard and annotate when no dashboard is running @mcp-windows-latest
❌ [msedge] › mcp/dashboard.spec.ts:204 › should keep CLI annotate engaged across mode switches @mcp-windows-latest
❌ [msedge] › mcp/dashboard.spec.ts:237 › should enter annotate mode on fresh dashboard.tsx mount with -s --annotate @mcp-windows-latest
❌ [msedge] › mcp/dashboard.spec.ts:262 › should switch screencast to -s session on show --annotate @mcp-windows-latest
❌ [msedge] › mcp/dashboard.spec.ts:312 › should disengage annotate mode when --annotate client disconnects @mcp-windows-latest
❌ [msedge] › mcp/dashboard.spec.ts:394 › stop recording streams WebM bytes to the chosen file @mcp-windows-latest

5564 passed, 715 skipped

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Merge workflow run.

[github-actions]

Test results for "tests 1"

7 flaky

⚠️ [chromium-library] › library/browser.spec.ts:73 › newContext should not leave a context upon failure `@ubuntu-22.04-chromium-tip-of-tree`
⚠️ [chromium-library] › library/browser.spec.ts:73 › newContext should not leave a context upon failure `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/browser.spec.ts:73 › newContext should not leave a context upon failure `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-library] › library/video.spec.ts:647 › screencast › should capture full viewport `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-library] › library/browser.spec.ts:73 › newContext should not leave a context upon failure `@chromium-ubuntu-22.04-node20`
⚠️ [chromium-library] › library/browser.spec.ts:73 › newContext should not leave a context upon failure `@chromium-ubuntu-22.04-node22`
⚠️ [webkit-library] › library/browser.spec.ts:73 › newContext should not leave a context upon failure `@webkit-ubuntu-22.04-node20`

35889 passed, 679 skipped

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Merge workflow run.