feat(ui): add React Query hooks for data fetching

- Add useFeatures, useFeature, useAgentOutput for feature data
- Add useGitHubIssues, useGitHubPRs, useGitHubValidations, useGitHubIssueComments
- Add useClaudeUsage, useCodexUsage with polling intervals
- Add useRunningAgents, useRunningAgentsCount
- Add useWorktrees, useWorktreeInfo, useWorktreeStatus, useWorktreeDiffs
- Add useGlobalSettings, useProjectSettings, useCredentials
- Add useAvailableModels, useCodexModels, useOpencodeModels
- Add useSessions, useSessionHistory, useSessionQueue
- Add useIdeationPrompts, useIdeas
- Add CLI status queries (claude, cursor, codex, opencode, github)
- Add useCursorPermissionsQuery, useWorkspaceDirectories
- Add usePipelineConfig, useSpecFile, useSpecRegenerationStatus

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/ui/src/hooks/queries/use-git.ts

@@ -0,0 +1,37 @@
+/**
+ * Git Query Hooks
+ *
+ * React Query hooks for git operations.
+ */
+
+import { useQuery } from '@tanstack/react-query';
+import { getElectronAPI } from '@/lib/electron';
+import { queryKeys } from '@/lib/query-keys';
+import { STALE_TIMES } from '@/lib/query-client';
+
+/**
+ * Fetch git diffs for a project (main project, not worktree)
+ *
+ * @param projectPath - Path to the project
+ * @param enabled - Whether to enable the query
+ * @returns Query result with files and diff content
+ */
+export function useGitDiffs(projectPath: string | undefined, enabled = true) {
+  return useQuery({
+    queryKey: queryKeys.git.diffs(projectPath ?? ''),
+    queryFn: async () => {
+      if (!projectPath) throw new Error('No project path');
+      const api = getElectronAPI();
+      const result = await api.git.getDiffs(projectPath);
+      if (!result.success) {
+        throw new Error(result.error || 'Failed to fetch diffs');
+      }
+      return {
+        files: result.files ?? [],
+        diff: result.diff ?? '',
+      };
+    },
+    enabled: !!projectPath && enabled,
+    staleTime: STALE_TIMES.WORKTREES,
+  });
+}