fix: brainstorm infinite loop, ghost cursor, embedding ::vector cast, semantic search, billing stats, usage meter accordion

- Fix useBrainstormSocket: stable guestId via useRef, remove setState in cleanup
- Fix GhostCursor: direct DOM manipulation via refs, no useState re-renders
- Fix all SQL embedding queries: add ::vector cast on text columns
- Fix embedding truncation to 15000 chars (under 8192 token limit)
- Fix NoteEmbedding INSERT: remove non-existent updatedAt column
- Fix billing page: show all quota stats in grid instead of single metric
- Fix usage meter: accordion expand/collapse, per-feature detail
- Fix semantic search: rebuild 103 note embeddings, ::vector cast on vectorSearch
- Fix brainstorm expand/manual-idea/create: ::vector cast on embedding SQL

memento-note/lib/entitlements.ts

@@ -31,6 +31,7 @@ export class QuotaExceededError extends Error {
   billingOwnerId?: string;
   triggeredByUserId?: string;
   isGuestActor?: boolean;
+  currentTier?: string;
 
   constructor(
     upgradeTier: 'PRO' | 'BUSINESS',
@@ -42,6 +43,7 @@ export class QuotaExceededError extends Error {
       billingOwnerId?: string;
       triggeredByUserId?: string;
       isGuestActor?: boolean;
+      currentTier?: string;
     },
   ) {
     super(`Quota exceeded for ${feature}`);
@@ -53,6 +55,7 @@ export class QuotaExceededError extends Error {
     this.billingOwnerId = sessionMeta?.billingOwnerId;
     this.triggeredByUserId = sessionMeta?.triggeredByUserId;
     this.isGuestActor = sessionMeta?.isGuestActor;
+    this.currentTier = sessionMeta?.currentTier;
   }
 
   toJSON() {
@@ -62,6 +65,7 @@ export class QuotaExceededError extends Error {
       upgradeTier: this.upgradeTier,
       byokConfigured: this.byokConfigured,
       isGuestActor: this.isGuestActor ?? false,
+      currentTier: this.currentTier,
     };
   }
 }
@@ -121,6 +125,18 @@ local newCount = tonumber(redis.call('GET', KEYS[1]))
 return newCount
 `;
 
+const INCREMENT_BY_LUA = `
+local count = tonumber(ARGV[1]) or 1
+local ttl = tonumber(ARGV[2])
+redis.call('INCRBY', KEYS[1], count)
+local ttlResult = redis.call('TTL', KEYS[1])
+if ttlResult == -1 then
+  redis.call('EXPIRE', KEYS[1], ttl)
+end
+local newCount = tonumber(redis.call('GET', KEYS[1]))
+return newCount
+`;
+
 const RESERVE_LUA = `
 local limit = tonumber(ARGV[1])
 local ttl = tonumber(ARGV[2])
@@ -252,6 +268,7 @@ export async function checkEntitlementOrThrow(
       result.limit,
       result.limit > 0 ? result.limit - result.remaining : 0,
       result.byokConfigured ?? false,
+      { currentTier: result.tier },
     );
   }
 }
@@ -261,7 +278,7 @@ export async function reserveUsageOrThrow(
   feature: string,
 ): Promise<void> {
   if (!isValidFeature(feature)) {
-    throw new QuotaExceededError('PRO', feature, 0, 0, false);
+    throw new QuotaExceededError('PRO', feature, 0, 0, false, { currentTier: 'BASIC' });
   }
 
   const tier = await getEffectiveTier(userId);
@@ -274,6 +291,7 @@ export async function reserveUsageOrThrow(
       0,
       0,
       false,
+      { currentTier: tier },
     );
   }
 
@@ -297,6 +315,7 @@ export async function reserveUsageOrThrow(
         limit,
         limit,
         byokConfigured,
+        { currentTier: tier },
       );
     }
   } catch (err) {
@@ -324,11 +343,11 @@ export async function checkSessionEntitlementOrThrow(
   }
 }
 
-export function incrementUsageAsync(userId: string, feature: string): Promise<void> {
+export function incrementUsageAsync(userId: string, feature: string, count: number = 1): Promise<void> {
   if (!isValidFeature(feature)) return Promise.resolve();
 
   const key = getRedisKey(userId, feature);
-  return redis.eval(INCREMENT_LUA, 1, key, String(TTL_SECONDS)).then(() => {}).catch((err) => {
+  return redis.eval(INCREMENT_BY_LUA, 1, key, String(count), String(TTL_SECONDS)).then(() => {}).catch((err) => {
     console.error('[entitlements] Async increment failed:', err);
   });
 }