feat: wire cookie-import-browser into browse server

Add cookie-picker route dispatch (no auth, localhost-only), add
cookie-import-browser to WRITE_COMMANDS and CHAIN_WRITE, add serverPort
property to BrowserManager, add write command with two modes (picker UI
vs --domain direct import), update CLI help text.

browse/src/write-commands.ts

@@ -6,6 +6,7 @@
  */
 
 import type { BrowserManager } from './browser-manager';
+import { findInstalledBrowsers, importCookies } from './cookie-import-browser';
 import * as fs from 'fs';
 import * as path from 'path';
 
@@ -253,6 +254,45 @@ export async function handleWriteCommand(
       return `Loaded ${cookies.length} cookies from ${filePath}`;
     }
 
+    case 'cookie-import-browser': {
+      // Two modes:
+      // 1. Direct CLI import: cookie-import-browser <browser> --domain <domain>
+      // 2. Open picker UI: cookie-import-browser [browser]
+      const browserArg = args[0];
+      const domainIdx = args.indexOf('--domain');
+
+      if (domainIdx !== -1 && domainIdx + 1 < args.length) {
+        // Direct import mode — no UI
+        const domain = args[domainIdx + 1];
+        const browser = browserArg || 'comet';
+        const result = await importCookies(browser, [domain]);
+        if (result.cookies.length > 0) {
+          await page.context().addCookies(result.cookies);
+        }
+        const msg = [`Imported ${result.count} cookies for ${domain} from ${browser}`];
+        if (result.failed > 0) msg.push(`(${result.failed} failed to decrypt)`);
+        return msg.join(' ');
+      }
+
+      // Picker UI mode — open in user's browser
+      const port = bm.serverPort;
+      if (!port) throw new Error('Server port not available');
+
+      const browsers = findInstalledBrowsers();
+      if (browsers.length === 0) {
+        throw new Error('No Chromium browsers found. Supported: Comet, Chrome, Arc, Brave, Edge');
+      }
+
+      const pickerUrl = `http://127.0.0.1:${port}/cookie-picker`;
+      try {
+        Bun.spawn(['open', pickerUrl], { stdout: 'ignore', stderr: 'ignore' });
+      } catch {
+        // open may fail silently — URL is in the message below
+      }
+
+      return `Cookie picker opened at ${pickerUrl}\nDetected browsers: ${browsers.map(b => b.name).join(', ')}\nSelect domains to import, then close the picker when done.`;
+    }
+
     default:
       throw new Error(`Unknown write command: ${command}`);
   }