feat: implement ReasonPrompt component with quick tags

- Create ReasonPrompt dialog for capturing optional reasons
- Add quick tag buttons (Blocking, Urgent, Context switch, etc.)
- Support keyboard navigation (Escape to cancel)
- Handle text input with trimming and null for empty
- Different titles for different actions (set_focus, defer, skip)
- All 10 tests pass

Closes bd-2p0

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src-tauri/src/watcher.rs

@@ -35,8 +35,16 @@ pub fn start_lore_watcher(app: AppHandle) -> Option<RecommendedWatcher> {
     // Create the watcher with a debounce of 1 second
     let mut watcher = RecommendedWatcher::new(
         move |res: Result<Event, notify::Error>| {
-            if let Ok(event) = res {
-                let _ = tx.send(event);
+            match res {
+                Ok(event) => {
+                    if tx.send(event).is_err() {
+                        // Receiver dropped -- watcher thread has exited
+                        tracing::debug!("Watcher event channel closed, receiver dropped");
+                    }
+                }
+                Err(e) => {
+                    tracing::warn!("File watcher error: {}", e);
+                }
             }
         },
         Config::default().with_poll_interval(Duration::from_secs(2)),
@@ -62,7 +70,9 @@ pub fn start_lore_watcher(app: AppHandle) -> Option<RecommendedWatcher> {
                 let affects_db = event.paths.iter().any(|p| p.ends_with("lore.db"));
                 if affects_db {
                     tracing::debug!("lore.db changed, emitting refresh event");
-                    let _ = app.emit("lore-data-changed", ());
+                    if let Err(e) = app.emit("lore-data-changed", ()) {
+                        tracing::warn!("Failed to emit lore-data-changed event: {}", e);
+                    }
                 }
             }
         }