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/frontends/tui/markdown.test.ts

@@ -109,4 +109,10 @@ describe('renderMarkdown', () => {
     expect(result).toContain('\x1b[34m');
     expect(result).toContain('https://example.com');
   });
+
+  it('decodes HTML entities like apostrophes', () => {
+    const result = renderMarkdown("I'm here. What's up?");
+    expect(result).toContain("I'm here");
+    expect(result).not.toContain(''');
+  });
 });

src/frontends/tui/markdown.ts

@@ -27,14 +27,7 @@ function convertHtmlToTerminal(text: string): string {
     // Horizontal rules
     .replace(/<hr\s*\/?>/gi, '─'.repeat(40) + '\n')
     // Strip any remaining HTML tags
-    .replace(/<[^>]+>/g, '')
-    // Decode common HTML entities
-    .replace(/&lt;/g, '<')
-    .replace(/&gt;/g, '>')
-    .replace(/&amp;/g, '&')
-    .replace(/&quot;/g, '"')
-    .replace(/&#39;/g, "'")
-    .replace(/&nbsp;/g, ' ');
+    .replace(/<[^>]+>/g, '');
 }
 
 // Custom renderer as an object for marked.use()
@@ -147,19 +140,29 @@ const terminalRenderer: RendererObject = {
   },
 
   html({ text }: Tokens.HTML | Tokens.Tag): string {
-    return convertHtmlToTerminal(text);
+    return decodeHtmlEntities(convertHtmlToTerminal(text));
   },
 };
 
 // Configure marked with our renderer
 marked.use({ renderer: terminalRenderer });
 
+function decodeHtmlEntities(text: string): string {
+  return text
+    .replace(/&lt;/g, '<')
+    .replace(/&gt;/g, '>')
+    .replace(/&amp;/g, '&')
+    .replace(/&quot;/g, '"')
+    .replace(/&#39;/g, "'")
+    .replace(/&nbsp;/g, ' ');
+}
+
 export function renderMarkdown(text: string): string {
   try {
     const rendered = marked.parse(text);
     // marked.parse can return string | Promise<string>, we only use sync
     if (typeof rendered === 'string') {
-      return rendered.trim();
+      return decodeHtmlEntities(rendered).trim();
     }
     return text;
   } catch {