feat(tui): persist model tier selection and fix formatting

Persist /model tier choice to ~/.local/share/flynn/preferences.json so
it survives restarts. Decode HTML entities (e.g. ') in markdown
renderer output. Suppress noisy logger.info and punycode deprecation
warnings in TUI startup.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/cli/tui.ts

@@ -75,7 +75,11 @@ export function registerTuiCommand(program: Command): void {
       // Dynamic imports to keep CLI startup fast
       const { SessionStore, SessionManager } = await import('../session/index.js');
 
-      setLogLevel(config.log_level);
+      // In the TUI, default to 'warn' so model-router and other info messages
+      // don't clutter the interactive terminal.  Honour the user's explicit
+      // choice if they set log_level to something more verbose.
+      const tuiLogLevel = config.log_level === 'debug' ? 'debug' : 'warn';
+      setLogLevel(tuiLogLevel);
       const { MinimalTui, startFullscreenTui } = await import('../frontends/tui/index.js');
       const { NativeAgent } = await import('../backends/index.js');
       const { ToolRegistry, ToolExecutor, allBuiltinTools, createWebSearchTools, createProcessTools, ProcessManager, createGmailTools, createGcalTools } = await import('../tools/index.js');
@@ -90,8 +94,16 @@ export function registerTuiCommand(program: Command): void {
 
       // Reuse the daemon's model router factory — includes auto-fallback,
       // local_providers, retry config, and per-tier fallback logic.
+      const { loadPreferences, savePreference } = await import('../preferences.js');
       const modelRouter = createModelRouter(config);
 
+      // Restore persisted model tier and save future changes
+      const prefs = loadPreferences(dataDir);
+      if (prefs.modelTier) {
+        modelRouter.setTier(prefs.modelTier as import('../models/router.js').ModelTier);
+      }
+      modelRouter.setOnTierChange((tier) => savePreference(dataDir, 'modelTier', tier));
+
       const { initPairingManager } = await import('../daemon/services.js');
       const pairingStore = config.pairing.enabled ? sessionStore.getPairingStore() : undefined;
       const pairingManager = initPairingManager(config, pairingStore);