Revert "fix: use directory watching instead of globs for chokidar v4 compatibility (#77)"

[graydawnc]

Reverts #77.

Why

PR #77 switched chokidar.watch(glob) to chokidar.watch(dirs), which restored event delivery on chokidar v4 but introduced a worse regression on macOS:

• chokidar v4/v5 removed the fsevents dependency entirely — on macOS it falls back to fs.watch, and each watched directory consumes one FD
• Recursive watching of ~/.claude/projects/ (373 subdirs locally) + ~/.codex/sessions/ (43 subdirs) blows past the macOS per-process soft FD limit (default 256)
• Result: EMFILE: too many open files, watch thrown inside FSWatcher._handle.onchange repeatedly
• Because watcher.ts has no .on('error', ...) handler, these surface as unhandled promise rejections that accumulate unboundedly (rejection id 9500+ within minutes)
• Accumulating rejections + synchronous syncFile() on each event → main process saturates, cursor shows spinner on hover, RSS grows

Reverting gets us back to the zero-events state (a bug) rather than the cascading-failure state (a worse bug). A proper fix is tracked in a follow-up issue.

Test plan

• pnpm build passes
• Dev app boots without EMFILE spam in console
• Accept: new sessions do not auto-appear in the UI until manual re-sync (pre-existing behavior under the silent-glob bug; tracked in follow-up)

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