fix: align comments and logs with actual behavior (drop cache, not close)

The heal path clears the cached dbp and reopens via indexedDB.open(),
but does not call db.close() on the old IDBDatabase. Updated comments
and log messages from 'close + reopen' to 'drop cached connection and
reopen' to match what the code actually does.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: leshniak

lib/storage/providers/IDBKeyValProvider/createStore.ts

@@ -109,7 +109,7 @@ function createStore(dbName: string, storeName: string): UseStore {
     // Handles two recoverable error classes:
     // 1. InvalidStateError — connection closed between getDB() resolving and db.transaction().
     //    Retry once with a fresh connection.
-    // 2. Backing store corruption (Chromium UnknownError) — close + reopen the IDB connection.
+    // 2. Backing store corruption (Chromium UnknownError) — drop cached connection and reopen the IDB connection.
     //    Bounded by a shared heal budget (3 attempts, reset on success).
     //    Mirrors Dexie's PR1398_maxLoop pattern: https://github.com/dexie/Dexie.js/blob/master/src/functions/temp-transaction.ts
     // Note: concurrent store() calls share the budget. Under overlapping failures each caller
@@ -132,7 +132,7 @@ function createStore(dbName: string, storeName: string): UseStore {
 
                 if (isBackingStoreError(error) && healAttemptsRemaining > 0) {
                     healAttemptsRemaining--;
-                    Logger.logInfo('IDB heal: backing store error, attempting close + reopen', {
+                    Logger.logInfo('IDB heal: backing store error, attempting drop cached connection and reopen', {
                         dbName,
                         storeName,
                         healAttemptsRemaining,

tests/unit/storage/providers/createStoreTest.ts

@@ -254,7 +254,7 @@ describe('createStore', () => {
             return new DOMException('Internal error opening backing store for indexedDB.open.', 'UnknownError');
         }
 
-        it('should heal mid-session by closing and reopening the connection', async () => {
+        it('should heal mid-session by dropping cached connection and reopening', async () => {
             const store = createStore(uniqueDBName(), STORE_NAME);
 
             await store('readwrite', (s) => {
@@ -275,7 +275,7 @@ describe('createStore', () => {
             const result = await store('readonly', (s) => IDB.promisifyRequest(s.get('key1')));
             expect(result).toBe('value');
             expect(callCount).toBe(2);
-            expect(logInfoSpy).toHaveBeenCalledWith('IDB heal: backing store error, attempting close + reopen', expect.objectContaining({healAttemptsRemaining: 2}));
+            expect(logInfoSpy).toHaveBeenCalledWith('IDB heal: backing store error, attempting drop cached connection and reopen', expect.objectContaining({healAttemptsRemaining: 2}));
         });
 
         it('should heal on init when indexedDB.open() rejects with UnknownError', async () => {