fix: memory analysis dark mode stripe, scan speed, and NaN total size

- Dark mode: add --el-fill-color-lighter and --el-table-current-row-bg-color
  to .el-table overrides so striped rows render with proper contrast
- Scan speed: add batchKeyMemoryUsage pipeline (TYPE + MEMORY USAGE in one
  Redis round-trip instead of 2×N sequential IPC calls)
- Scan speed: decouple scan loop from UI via 300ms flush buffer, keeping
  el-table re-render frequency capped at ~3/s
- Scan speed: use shallowRef for entries to skip deep reactive proxies
- NaN fix: handle ioredis stringNumbers:true by converting via Number()
  instead of typeof === 'number'
- formatSize: guard against non-finite input, add TB/PB units

src/main/ipc-handlers.ts

@@ -149,6 +149,9 @@ export function registerIpcHandlers(): void {
   ipcMain.handle('redis:memoryUsage', async (_e, id: string, key: string) => {
     return redis.memoryUsage(id, key)
   })
+  ipcMain.handle('redis:batchMemoryUsage', async (_e, id: string, keys: string[]) => {
+    return redis.batchKeyMemoryUsage(id, keys)
+  })
 
   // Redis - String
   ipcMain.handle('redis:getString', async (_e, id: string, key: string) => {