feat(ui): add React Query mutation hooks

- Add feature mutations (create, update, delete with optimistic updates)
- Add auto-mode mutations (start, stop, approve plan)
- Add worktree mutations (create, delete, checkout, switch branch)
- Add settings mutations (update global/project, validate API keys)
- Add GitHub mutations (create PR, validate PR)
- Add cursor permissions mutations (apply profile, copy config)
- Add spec mutations (generate, update, save)
- Add pipeline mutations (toggle, update config)
- Add session mutations with cache invalidation

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

apps/ui/src/hooks/mutations/use-ideation-mutations.ts

@@ -0,0 +1,82 @@
+/**
+ * Ideation Mutation Hooks
+ *
+ * React Query mutations for ideation operations like generating suggestions.
+ */
+
+import { useMutation, useQueryClient } from '@tanstack/react-query';
+import { getElectronAPI } from '@/lib/electron';
+import { queryKeys } from '@/lib/query-keys';
+import { toast } from 'sonner';
+import type { IdeaCategory, IdeaSuggestion } from '@automaker/types';
+
+/**
+ * Input for generating ideation suggestions
+ */
+interface GenerateSuggestionsInput {
+  promptId: string;
+  category: IdeaCategory;
+}
+
+/**
+ * Result from generating suggestions
+ */
+interface GenerateSuggestionsResult {
+  suggestions: IdeaSuggestion[];
+  promptId: string;
+  category: IdeaCategory;
+}
+
+/**
+ * Generate ideation suggestions based on a prompt
+ *
+ * @param projectPath - Path to the project
+ * @returns Mutation for generating suggestions
+ *
+ * @example
+ * ```tsx
+ * const generateMutation = useGenerateIdeationSuggestions(projectPath);
+ *
+ * generateMutation.mutate({
+ *   promptId: 'prompt-1',
+ *   category: 'ux',
+ * }, {
+ *   onSuccess: (data) => {
+ *     console.log('Generated', data.suggestions.length, 'suggestions');
+ *   },
+ * });
+ * ```
+ */
+export function useGenerateIdeationSuggestions(projectPath: string) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (input: GenerateSuggestionsInput): Promise<GenerateSuggestionsResult> => {
+      const { promptId, category } = input;
+
+      const api = getElectronAPI();
+      if (!api.ideation?.generateSuggestions) {
+        throw new Error('Ideation API not available');
+      }
+
+      const result = await api.ideation.generateSuggestions(projectPath, promptId, category);
+
+      if (!result.success) {
+        throw new Error(result.error || 'Failed to generate suggestions');
+      }
+
+      return {
+        suggestions: result.suggestions ?? [],
+        promptId,
+        category,
+      };
+    },
+    onSuccess: () => {
+      // Invalidate ideation ideas cache
+      queryClient.invalidateQueries({
+        queryKey: queryKeys.ideation.ideas(projectPath),
+      });
+    },
+    // Toast notifications are handled by the component since it has access to prompt title
+  });
+}