docs(quick-1): complete arrow key navigation and directory description plan

.planning/STATE.md

@@ -80,10 +80,13 @@ Recent decisions affecting current work:
 - [Phase 04-03]: try_recv drain loop per poll iteration — drains all queued events, debounce collapses burst into single reload
 - [Phase 04-03]: FileWatcher initialized in main.rs before App::new() — avoids self-referential ownership, keeps constructor pure
 - [Phase 04-03]: Non-fatal watcher failure — warning printed, None passed to App, app runs without live reload
+- [quick-1]: Bare Left/Right match arms placed after Alt+Left/Alt+Right guards — match order ensures Alt combos consumed first
+- [quick-1]: BufReader + take(20) for frontmatter parsing — avoids loading entire large files
+- [quick-1]: span_len covers only [name] bracket not description — keeps Tab-cycling highlight correct
 
 ### Pending Todos
 
-None. Project complete.
+None. Project complete. Quick task 1 executed.
 
 ### Blockers/Concerns
 
@@ -95,5 +98,5 @@ All blockers resolved:
 ## Session Continuity
 
 Last session: 2026-03-01
-Stopped at: PROJECT COMPLETE — Completed 04-03-PLAN.md (final plan)
-Resume file: N/A — project complete
+Stopped at: Completed quick-1 (arrow key navigation + directory descriptions)
+Resume file: N/A — project complete, quick task 1 done