feat(notes): support mobile all-workspace view

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

@@ -21,7 +21,9 @@ export default function CaptureScreen() {
     <View style={styles.container}>
       <Text style={styles.title}>Quick capture</Text>
       <Text style={styles.subtitle}>
-        Create a lightweight mobile draft in {activeWorkspaceName}. Offline queue wiring comes in a later batch.
+        {activeWorkspaceId
+          ? `Create a lightweight mobile draft in ${activeWorkspaceName}. Offline queue wiring comes in a later batch.`
+          : 'Choose a workspace to save this mobile draft. Offline queue wiring comes in a later batch.'}
       </Text>
       <View style={styles.workspaceRow}>
         {workspaces.map((workspace: MobileWorkspace) => {
@@ -72,9 +74,10 @@ export default function CaptureScreen() {
           setTitle('');
           setBody('');
         }}
-        style={styles.button}
+        disabled={!activeWorkspaceId}
+        style={[styles.button, !activeWorkspaceId ? styles.buttonDisabled : null]}
       >
-        <Text style={styles.buttonText}>Save draft</Text>
+        <Text style={styles.buttonText}>{activeWorkspaceId ? 'Save draft' : 'Select workspace'}</Text>
       </Pressable>
       {saved ? <Text style={styles.saved}>Draft saved to the product backend.</Text> : null}
       <View style={styles.card}>
@@ -125,6 +128,9 @@ const styles = StyleSheet.create({
     color: colors.textPrimary,
     fontWeight: '700',
   },
+  buttonDisabled: {
+    opacity: 0.6,
+  },
   saved: {
     color: colors.success,
     fontSize: 14,

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

@@ -40,6 +40,14 @@ export default function HomeScreen() {
         <Text style={styles.summaryMeta}>{visibleCount} visible notes ready for quick retrieval</Text>
       </View>
       <ScrollView horizontal showsHorizontalScrollIndicator={false} contentContainerStyle={styles.workspaceRow}>
+        <Pressable
+          onPress={() => setActiveWorkspace(null)}
+          style={[styles.workspaceChip, activeWorkspaceId === null ? styles.workspaceChipActive : null]}
+        >
+          <Text style={[styles.workspaceChipText, activeWorkspaceId === null ? styles.workspaceChipTextActive : null]}>
+            All
+          </Text>
+        </Pressable>
         {workspaces.map((workspace: MobileWorkspace) => {
           const isActive = workspace.id === activeWorkspaceId;
 

mobile/src/store/workspace-store.ts

@@ -5,20 +5,26 @@ export type WorkspaceState = {
   workspaces: MobileWorkspace[];
   activeWorkspaceId: string | null;
   hydrate: () => Promise<void>;
-  setActiveWorkspace: (id: string) => void;
+  setActiveWorkspace: (id: string | null) => void;
 };
 
-export const useWorkspaceStore = create<WorkspaceState>((set) => ({
+export const useWorkspaceStore = create<WorkspaceState>((set, get) => ({
   workspaces: [],
   activeWorkspaceId: null,
   async hydrate() {
     const workspaces = await listWorkspaces();
+    const currentActiveWorkspaceId = get().activeWorkspaceId;
     set({
       workspaces,
-      activeWorkspaceId: workspaces[0]?.id ?? null,
+      activeWorkspaceId:
+        currentActiveWorkspaceId === null
+          ? null
+          : workspaces.some((workspace) => workspace.id === currentActiveWorkspaceId)
+            ? currentActiveWorkspaceId
+            : workspaces[0]?.id ?? null,
     });
   },
-  setActiveWorkspace(id: string) {
+  setActiveWorkspace(id: string | null) {
     set({ activeWorkspaceId: id });
   },
 }));