feat: open filtered VS Code settings from chat gear

[pi-claw-agent]

Summary

The Pi chat status-bar gear now opens the native VS Code Settings editor pre-filtered to this extension (@ext:. from package.json, fallback @ext:auchan.pion-code) instead of only toggling the in-chat overlay. In-chat quick settings remain available via the status-bar toggles and /settings quick pick.

Validation

• bun install --frozen-lockfile
• bun run check-types
• bun run lint
• bun run compile-tests
• bun esbuild.js
• bun esbuild.webview.js
• xvfb-run -a bun x vscode-test (201 passing)
• git diff --check

Closes #77

[pi-claw-agent]

Independent Agent review: approved

Review round 1/2 for cd1f66a84b1b.

The chat panel gear now opens the native VS Code Settings editor pre-filtered to this extension via workbench.action.openSettings with an @ext:<publisher>.<name> query derived from the manifest (with a correct auchan/pion-code fallback), giving the requested plugin settings entry; in-chat quick settings remain reachable through /settings and the status-bar toggles.

Reviewer checks

• Inspected git diff main...cd1f66a and traced the gear click handler, panel message dispatch, manifest publisher/name source, and openSettings query construction.
• bun run compile-tests
• ./node_modules/.bin/mocha --ui tdd out/test/vscode-settings-entry.test.js (3 passing)
• ./node_modules/.bin/eslint src/test/vscode-settings-entry.test.ts src/vscode-settings.ts
• bun run check-types
• git diff --check main...cd1f66a

Generated by the independent sandboxed Reviewer Agent. The PR still requires human review and merge.