extract workspace crates and switch to gpui-native-kit

docs/gpui-native-kit-gaps.md

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+# gpui-native-kit gaps
+
+Known Signed features the kit does not currently support. Recorded instead of
+modifying the kit or reimplementing a parallel mechanism.
+
+1. **Custom themes.** `Signed Light`/`Signed Dark`, theme registry names, font
+   sizes, radii, focus ring, and shadows are removed. The kit derives colors,
+   radii, fonts, and chrome from the OS; `AppearanceMode` is preserved through
+   `set_mode_override`/`follow_system`.
+2. **Tab bar navigation.** The previous/next tab buttons and
+   `tab_bar.hide_navigation_buttons` are removed; the kit tab strip has none.
+3. **Traffic-light placement.** Custom macOS traffic-light position and the 44px
+   tab bar are removed. The kit uses `theme.titlebar_height` and a fixed 78px
+   traffic-light pad.
+4. **Virtual list.** The kit has no data-driven virtual list. Screens keep
+   `gpui::uniform_list` for fixed-height lists and `ScrollArea` for the Inbox.
+5. **Editable code field.** The kit code view is read-only and supports four
+   grammars. Signed only previews files read-only; other extensions render as
+   plain text.
+6. **Hunk-only diffs.** Kit `DiffViewState` needs the full old and new texts;
+   `CommitDiff` carries hunks only. The custom hunk rows are retained.
+7. **Tree data.** The kit tree is flat with caller-managed expansion, and has no
+   file glyph; folders use the folder role.
+8. **Dynamic dock panels.** `DockState` has no unregister or `open_view` API.
+   Per-repository/per-entity panels register a builder keyed by a unique id and
+   stay in the builder map. No dock persistence, zoom, or bottom/right
+   placement; splits only.
+9. **Dialogs.** Dialogs are elements mounted at the window root; there is no
+   `window.open_dialog`, dialog stack, or non-dismissible option. A single-slot
+   `DialogHost` is used, and the passphrase dialog ignores dismiss requests.
+10. **Notifications.** The kit toast shows one toast at a time; backend errors
+    queue but only the current toast is visible.
+11. **Segmented badges.** `Segmented` has no badge slot; filter counts fold
+    into labels.
+12. **Combobox trigger.** `Combobox` has no custom trigger renderer; branch/tag
+    selectors lose the leading git icon and custom caret.
+13. **Icons.** The built-in role set is limited. App-specific glyphs remain in
+    `assets::CustomIconName` through `IconNamed`; kit icons are unpainted
+    unless given a color.