fix(ui): provider-aware context rail branding for GitLab

packages/ui/src/lib/surfaces/DOCUMENTATION.md

@@ -23,10 +23,11 @@ edge (`components/layout/ContextPanelRail.tsx`) and rendered by
 - `getVisibleContextRailSurfaces` is the single visibility filter shared by the
   rail and the global surface-switch shortcut (`switch_context_surface` in
   `lib/shortcuts.ts`): it drops the plan surface unless plan mode is enabled,
-  drops the walkthrough on VS Code and below `WALKTHROUGH_MIN_WIDTH`, and hides
-  `has-content` surfaces until a tab of their mode exists. Both consumers use
-  it so the digit shown on a rail badge always maps to the same surface the
-  shortcut opens.
+  drops the walkthrough on VS Code and below `WALKTHROUGH_MIN_WIDTH`, hides
+  `has-content` surfaces until a tab of their mode exists, and drops the `pr`
+  surface when the repository is on a git provider other than GitHub or GitLab
+  (`gitProvider: 'other'`). Both consumers use it so the digit shown on a rail
+  badge always maps to the same surface the shortcut opens.
 
 ## Adding a surface
 

packages/ui/src/lib/surfaces/registry.test.ts

@@ -59,6 +59,17 @@ describe('getVisibleContextRailSurfaces', () => {
     expect(getVisibleContextRailSurfaces(baseOptions).some((s) => s.id === 'browser')).toBe(true);
   });
 
+  test('hides the pr surface for other git providers but keeps it for github/gitlab', () => {
+    expect(getVisibleContextRailSurfaces({ ...baseOptions, gitProvider: 'other' }).some((s) => s.id === 'pr')).toBe(false);
+    expect(getVisibleContextRailSurfaces({ ...baseOptions, gitProvider: 'gitlab' }).some((s) => s.id === 'pr')).toBe(true);
+    expect(getVisibleContextRailSurfaces({ ...baseOptions, gitProvider: 'github' }).some((s) => s.id === 'pr')).toBe(true);
+  });
+
+  test('keeps the pr surface while the git provider is unknown', () => {
+    expect(getVisibleContextRailSurfaces({ ...baseOptions, gitProvider: null }).some((s) => s.id === 'pr')).toBe(true);
+    expect(getVisibleContextRailSurfaces(baseOptions).some((s) => s.id === 'pr')).toBe(true);
+  });
+
   test('respects the persisted user rail order', () => {
     const surfaces = getVisibleContextRailSurfaces({ ...baseOptions, railOrder: ['git', 'context'] });
     expect(surfaces.slice(0, 2).map((surface) => surface.id)).toEqual(['git', 'context']);

packages/ui/src/lib/surfaces/registry.ts

@@ -188,6 +188,12 @@ type VisibleRailSurfacesOptions = {
   isVSCode: boolean;
   screenWidth: number;
   tabs: readonly { mode: ContextPanelMode }[];
+  /**
+   * The repository's git provider. The 'pr' surface renders the GitHub pull
+   * request / GitLab merge request view; it is hidden for repositories on
+   * any other provider. null (unknown, still resolving) keeps it visible.
+   */
+  gitProvider?: 'github' | 'gitlab' | 'other' | null;
 };
 
 /**
@@ -203,6 +209,13 @@ export const getVisibleContextRailSurfaces = (options: VisibleRailSurfacesOption
     if (surface.id === 'plan' && !options.planModeEnabled) {
       return false;
     }
+    // The 'pr' surface hosts the GitHub PR / GitLab MR view. Neither applies
+    // to repositories on other providers, so the rail button (and its shortcut
+    // digit) must not appear. Unknown (null) keeps it while the provider is
+    // still resolving — it is not a reason to hide the surface.
+    if (surface.id === 'pr' && options.gitProvider === 'other') {
+      return false;
+    }
     // The walkthrough needs room for a stop list beside real code, and its
     // diffs come from OpenChamber's Git routes, which VS Code does not serve.
     if (surface.id === 'walkthrough' && (options.isVSCode || options.screenWidth < WALKTHROUGH_MIN_WIDTH)) {