fix(mobile): align PromptCategory with backend, add tone param, remove dead import

- note-prompts.ts: fix PromptCategory ('analysis' → 'analyze', remove nonexistent 'vision'/'custom')
- note-prompts.ts: add CopilotTone type and optional tone param to copilotTransform
- capture.tsx: remove unused copilotTransform import (copilot requires real noteId)

mobile/src/api/note-prompts.ts

@@ -1,6 +1,6 @@
 import { getApiClient } from './client';
 
-export type PromptCategory = 'transform' | 'extract' | 'generate' | 'analysis' | 'vision' | 'export' | 'custom';
+export type PromptCategory = 'transform' | 'extract' | 'generate' | 'analyze' | 'export';
 export type PromptInputType = 'text' | 'image' | 'text+image' | 'multi-note';
 export type PromptOutputType = 'new_note' | 'artifact' | 'update_note';
 
@@ -70,15 +70,18 @@ export async function extractFromUrl(
   });
 }
 
+export type CopilotTone = 'formal' | 'casual' | 'professional' | 'friendly';
+
 export async function copilotTransform(
   noteId: string,
   workspaceId: string,
   action: string,
   text: string,
+  tone?: CopilotTone,
 ): Promise<string> {
   const res = await getApiClient().fetch<{ text: string }>(
     `/notes/${encodeURIComponent(noteId)}/copilot`,
-    { method: 'POST', body: JSON.stringify({ workspaceId, action, text }) },
+    { method: 'POST', body: JSON.stringify({ workspaceId, action, text, ...(tone ? { tone } : {}) }) },
   );
   return res.text;
 }

mobile/src/app/(tabs)/capture.tsx

@@ -4,7 +4,7 @@ import * as Clipboard from 'expo-clipboard';
 import type { MobileWorkspace } from '../../api/workspaces';
 import { useNotesStore, type NotesState } from '../../store/notes-store';
 import { useWorkspaceStore, type WorkspaceState } from '../../store/workspace-store';
-import { extractFromUrl, copilotTransform } from '../../api/note-prompts';
+import { extractFromUrl } from '../../api/note-prompts';
 import { colors } from '../../theme';
 
 type CaptureMode = 'text' | 'photo' | 'voice' | 'url' | 'scan' | 'paste';