feat(search): add saved PR views

[pmusaraj]

What this changes

Adds named, editable pull request search views inside the GitHub sidebar. A saved query can find PRs beyond the viewer's personal relationships and watched owners, using GitHub's Boolean search syntax and rolling date filters. Results preserve GitHub ordering and reuse the existing details, checks, label, review, and workspace actions.

Views are stored per host, start empty, and support preview, rename, edit, delete, refresh, and cursor pagination. Relative dates resolve in UTC at fetch time; ordinary board filters do not alter saved search results.

Checks

• Automated tests cover query scoping and date expansion, settings validation and selected-view fallback, search mapping and errors, pagination deduplication, and cache invalidation during in-flight requests.
• npm test: 75 tests passed across 13 files.
• npm run typecheck: passed.
• npm run lint: passed (two pre-existing complexity warnings in scripts/lib/scan.mjs).
• A runtime-only acceptance query was verified against direct GitHub GraphQL results and the running development plugin's RPC. No personal queries or result IDs are committed.
• The development plugin loaded successfully without restarting the daemon.

UI

• Headless Chrome component checks passed create, preview, save, rename, and delete at 1200px and 390px in light and dark themes using mocked Paseo services. Screenshots were visually inspected. This is separate from the live daemon RPC check.
• Native iOS/Android Hermes verification remains a manual check.

Paseo version

Uses existing Paseo 0.8 plugin APIs. Saved searches use GitHub's ISSUE_ADVANCED GraphQL search type; API errors are surfaced rather than silently falling back to legacy search semantics.

[pmusaraj]

For the maintainers: I have just started using the plugin and found this feature useful. Hopefully you accept PRs.