fix: patch all P1 bugs from project review

- pubsub: add sender.isDestroyed() checks + destroyed event auto-cleanup (P1#10)
- pubsub: add .catch() to monitor() promise + isDestroyed check (P1#11)
- connection: move server.on('error') before server.listen() (P1#12)
- preload: onSubscribeMessage/onMonitorMessage return cleanup functions (P1#9)
- CliView: save and call IPC listener cleanup in onUnmounted (P1#9)
- KeyDetail: move setInterval into onMounted, cleanup in onUnmounted (P1#8)
- key store: add loadKeyVersion guard to prevent race condition (P1#13)
- ListEditor: LSET sentinel + LREM for index-based deletion (P1#14)
- ipc-handlers: remove non-null assertion, add null guard in reorderConnections (P1#16)
- StreamEditor: add Confirm/Cancel buttons to Trim dialog (P1#17)
- KeyBrowser: remove { immediate: true } to prevent double scan (P1#18)
- P1#7 MULTI/EXEC: investigated, not a bug (Redis server handles queuing)
- docs: update PROJECT_REVIEW.md with P1 fix status

src/main/ipc-handlers.ts

@@ -95,10 +95,11 @@ export function registerIpcHandlers(): void {
   ipcMain.handle('storage:reorderConnections', (_e, ids: string[]) => {
     const connections = store.get('connections', [])
     const reordered = ids.map((id, i) => {
-      const conn = connections.find((c: ConnectionConfig) => c.id === id)!
+      const conn = connections.find((c: ConnectionConfig) => c.id === id)
+      if (!conn) return null
       conn.order = i
       return conn
-    })
+    }).filter((c): c is ConnectionConfig => c !== null)
     store.set('connections', reordered)
     return reordered
   })