fix: implement tag suggestions functionality

Backend changes:
- Fix ListAllUserStats to calculate and return tag statistics
- Previously only returned name and timestamps, missing TagCount
- Now properly aggregates tags, pinned memos, and memo type stats

Frontend changes:
- Initialize user stats on app startup to populate tag data
- Show all tags when typing just '#' (fix empty Fuse.js search)
- Auto-refresh stats after creating/updating/deleting memos
- Fix Checkbox component ref warning with forwardRef

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>

server/router/api/v1/user_service_stats.go

@@ -49,14 +49,59 @@ func (s *APIV1Service) ListAllUserStats(ctx context.Context, _ *v1pb.ListAllUser
 
 	userMemoStatMap := make(map[int32]*v1pb.UserStats)
 	for _, memo := range memos {
+		// Initialize user stats if not exists
+		if _, exists := userMemoStatMap[memo.CreatorID]; !exists {
+			userMemoStatMap[memo.CreatorID] = &v1pb.UserStats{
+				Name:                  fmt.Sprintf("users/%d/stats", memo.CreatorID),
+				TagCount:              make(map[string]int32),
+				MemoDisplayTimestamps: []*timestamppb.Timestamp{},
+				PinnedMemos:           []string{},
+				MemoTypeStats: &v1pb.UserStats_MemoTypeStats{
+					LinkCount: 0,
+					CodeCount: 0,
+					TodoCount: 0,
+					UndoCount: 0,
+				},
+			}
+		}
+
+		stats := userMemoStatMap[memo.CreatorID]
+
+		// Add display timestamp
 		displayTs := memo.CreatedTs
 		if instanceMemoRelatedSetting.DisplayWithUpdateTime {
 			displayTs = memo.UpdatedTs
 		}
-		userMemoStatMap[memo.CreatorID] = &v1pb.UserStats{
-			Name: fmt.Sprintf("users/%d/stats", memo.CreatorID),
+		stats.MemoDisplayTimestamps = append(stats.MemoDisplayTimestamps, timestamppb.New(time.Unix(displayTs, 0)))
+
+		// Count memo stats
+		stats.TotalMemoCount++
+
+		// Count tags and other properties
+		if memo.Payload != nil {
+			for _, tag := range memo.Payload.Tags {
+				stats.TagCount[tag]++
+			}
+			if memo.Payload.Property != nil {
+				if memo.Payload.Property.HasLink {
+					stats.MemoTypeStats.LinkCount++
+				}
+				if memo.Payload.Property.HasCode {
+					stats.MemoTypeStats.CodeCount++
+				}
+				if memo.Payload.Property.HasTaskList {
+					stats.MemoTypeStats.TodoCount++
+				}
+				if memo.Payload.Property.HasIncompleteTasks {
+					stats.MemoTypeStats.UndoCount++
+				}
+			}
+		}
+
+		// Track pinned memos
+		if memo.Pinned {
+			stats.PinnedMemos = append(stats.PinnedMemos, fmt.Sprintf("users/%d/memos/%d", memo.CreatorID, memo.ID))
 		}
-		userMemoStatMap[memo.CreatorID].MemoDisplayTimestamps = append(userMemoStatMap[memo.CreatorID].MemoDisplayTimestamps, timestamppb.New(time.Unix(displayTs, 0)))
 	}
 
 	userMemoStats := []*v1pb.UserStats{}

web/src/components/MemoEditor/Editor/TagSuggestions.tsx

@@ -38,6 +38,9 @@ const TagSuggestions = observer(({ editorRef, editorActions }: Props) => {
   const suggestionsRef = useRef<string[]>([]);
   suggestionsRef.current = (() => {
     const search = getCurrentWord()[0].slice(1).toLowerCase();
+    if (search === "") {
+      return tags; // Show all tags when no search term
+    }
     const fuse = new Fuse(tags);
     return fuse.search(search).map((result) => result.item);
   })();

web/src/components/ui/checkbox.tsx

@@ -3,9 +3,13 @@ import { CheckIcon } from "lucide-react";
 import * as React from "react";
 import { cn } from "@/lib/utils";
 
-function Checkbox({ className, ...props }: React.ComponentProps<typeof CheckboxPrimitive.Root>) {
+const Checkbox = React.forwardRef<
+  React.ElementRef<typeof CheckboxPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof CheckboxPrimitive.Root>
+>(({ className, ...props }, ref) => {
   return (
     <CheckboxPrimitive.Root
+      ref={ref}
       data-slot="checkbox"
       className={cn(
         "peer border-border data-[state=checked]:bg-primary data-[state=checked]:text-primary-foreground data-[state=checked]:border-primary size-4 shrink-0 rounded-[4px] border shadow-xs transition-shadow disabled:cursor-not-allowed disabled:opacity-50",
@@ -18,6 +22,7 @@ function Checkbox({ className, ...props }: React.ComponentProps<typeof CheckboxP
       </CheckboxPrimitive.Indicator>
     </CheckboxPrimitive.Root>
   );
-}
+});
+Checkbox.displayName = "Checkbox";
 
 export { Checkbox };

web/src/store/memo.ts

@@ -3,6 +3,7 @@ import { makeAutoObservable } from "mobx";
 import { memoServiceClient } from "@/grpcweb";
 import { CreateMemoRequest, ListMemosRequest, Memo } from "@/types/proto/api/v1/memo_service";
 import { RequestDeduplicator, createRequestKey, StoreError } from "./store-utils";
+import userStore from "./user";
 
 class LocalState {
   stateId: string = uniqueId();
@@ -112,6 +113,8 @@ const memoStore = (() => {
       stateId: uniqueId(),
       memoMapByName: memoMap,
     });
+    // Refresh user stats to update tag counts
+    userStore.fetchUserStats().catch(console.error);
     return memo;
   };
 
@@ -142,6 +145,8 @@ const memoStore = (() => {
         stateId: uniqueId(),
         memoMapByName: confirmedMemoMap,
       });
+      // Refresh user stats to update tag counts
+      userStore.fetchUserStats().catch(console.error);
       return memo;
     } catch (error) {
       // Rollback on error
@@ -166,6 +171,8 @@ const memoStore = (() => {
       stateId: uniqueId(),
       memoMapByName: memoMap,
     });
+    // Refresh user stats to update tag counts
+    userStore.fetchUserStats().catch(console.error);
   };
 
   return {

web/src/store/user.ts

@@ -343,10 +343,10 @@ export const initialUserStore = async () => {
       },
     });
 
-    // Step 3: Fetch user settings
+    // Step 3: Fetch user settings and stats
     // CRITICAL: This must happen after currentUser is set in step 2
-    // The fetchUserSettings() method checks state.currentUser internally
-    await userStore.fetchUserSettings();
+    // The fetchUserSettings() and fetchUserStats() methods check state.currentUser internally
+    await Promise.all([userStore.fetchUserSettings(), userStore.fetchUserStats()]);
 
     // Step 4: Apply user preferences to instance
     // CRITICAL: This must happen after fetchUserSettings() completes