fix: document non-streaming fallback compatibility with mid-session watchdog (#232)

Confirms usage tracking is correct for non-streaming API responses and
documents the intentional 5-min/2-min timing relationship with CLI v2.1.79.

src-tauri/src/wsl_bridge.rs

@@ -630,6 +630,9 @@ impl WslBridge {
         let process_mid_watchdog = self.process.clone();
         let pending_since_watchdog = self.pending_since.clone();
         let generation_watchdog = self.watchdog_generation.clone();
+        // 5-minute stuck timeout is intentionally larger than the CLI's 2-minute per-attempt
+        // non-streaming fallback (added in v2.1.79). A non-streaming response will either
+        // succeed or fail with a Result message well within this window.
         const STUCK_TIMEOUT: Duration = Duration::from_secs(5 * 60);
         const POLL_INTERVAL: Duration = Duration::from_secs(30);
         thread::spawn(move || {