* Add Cmd-J tab session search
References docs/cmd-j-tab-session-search.md for the design.
* Support searching and activating all editor-family tab types
- Index and search editor, diff, conflict-review, and check-details tabs when their backing files are open.
- Deduplicate tab activation logic to ensure exact unified tab IDs are targeted correctly.
- Update palette placeholder texts and localized labels to use "tab title" and "agent prompt" instead of "page title" and "emulator".
- Localize missing tab error strings in Spanish, Japanese, Korean, and Chinese locales.
- Ensure cross-platform path compatibility in search tests using path.join.
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