Fix H3/M33/L25/L32: fix probe dependency, correct ipc comment, throttle taskbar, memoize palette

H3: probe.ts now imports fmtBytes from lib/formatters instead of download.ts,
    breaking the circular probe->download dependency direction.
M33: ipc.ts comment corrected to reflect that no batch cap exists; notes the
     known M33 issue for future implementation.
L25: App.tsx taskbar subscriber skips IPC when fraction/mode/badge unchanged,
     eliminating redundant roundtrips on every progress tick.
L32: paletteActions wrapped in useMemo so CommandPalette sees a stable array
     reference; only rebuilds when isDark changes.

typecheck + 242 tests + eslint + prettier green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/main/probe.ts

@@ -1,7 +1,7 @@
 import { execFile } from 'child_process'
 import { existsSync } from 'fs'
 import { getYtdlpPath } from './binaries'
-import { fmtBytes } from './download'
+import { fmtBytes } from './lib/formatters'
 import { cleanError } from './log'
 import { assertHttpUrl } from './url'
 import { entryUrl, fmtDuration, type RawEntry } from './indexerCore'