- Added external editor callback support to extension UI dialogs and hook selector for opening plans in external editor.
- Added `matchesAppExternalEditor()` keybinding matcher to detect external editor shortcuts (ctrl+g) across components.
- Added `trimTrailingNewline` option to `openInEditor()` function to preserve trailing newlines when editing externally.
- Modified plan review flow to re-read plan content from disk before approval to reflect external editor changes.
- Refactored plan preview rendering to cache and reuse UI container instead of recreating children on each render.
- Refactored Promise creation in external editor utility to use `Promise.withResolvers()` for cleaner async handling.
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