feat(frame): move the watermark controls into a FRAME sub-panel

src/components/ToolRail.tsx

@@ -2,14 +2,11 @@ import React from 'react';
 import { View, Text, TouchableOpacity, ScrollView } from 'react-native';
 import * as Haptics from 'expo-haptics';
 
-export type TabId = 'recipes' | 'favorites' | 'iq' | 'wb' | 'filters' | 'frame' | 'watermark';
+export type TabId = 'recipes' | 'favorites' | 'iq' | 'wb' | 'filters' | 'frame';
 
 interface ToolRailProps {
   activeTab: TabId | null;
   onToggle: (tab: TabId) => void;
-  // FRAME only exists in library mode (camera shows every frame WYSIWYG through
-  // the viewfinder overlays); WATERMARK is available in both modes.
-  mode: 'camera' | 'library';
 }
 
 const TOOLS: { id: TabId; label: string }[] = [
@@ -19,12 +16,12 @@ const TOOLS: { id: TabId; label: string }[] = [
   { id: 'wb', label: 'WB' },
   { id: 'filters', label: 'FX' },
   { id: 'frame', label: 'FRAME' },
-  { id: 'watermark', label: 'WATERMARK' },
 ];
 
-export default function ToolRail({ activeTab, onToggle, mode }: ToolRailProps) {
-  // FRAME (frame picker) belongs to library stills only: camera mode hides it.
-  const tools = TOOLS.filter((t) => t.id !== 'frame' || mode === 'library');
+export default function ToolRail({ activeTab, onToggle }: ToolRailProps) {
+  // FRAME is on in BOTH modes: the camera composes through the frame's window
+  // WYSIWYG (and WATERMARK now lives inside this tab).
+  const tools = TOOLS;
   return (
     <View className="py-1.5">
       <ScrollView