Add Firefox cookie import and stealth mode

- Firefox cookie importer: reads cookies.sqlite with WAL-safe copy,
  profile detection via profiles.ini, cross-platform paths, domain filtering
- Stealth mode: opt-in via launch(stealth: true), patches navigator.webdriver,
  plugins/mimeTypes, permissions API, WebGL renderer, iframe isolation,
  languages, plus realistic Safari UA and context hardening
- Import tool now accepts 'safari' | 'firefox' source
- STEALTH.md reference documentation
- Upgraded @types/node to v25 for node:sqlite support

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

dist/firefox.d.ts

@@ -0,0 +1,58 @@
+/**
+ * Firefox cookie importer
+ *
+ * Reads cookies from Firefox's cookies.sqlite database.
+ * Firefox stores cookies as plain unencrypted SQLite — no binary parsing needed.
+ *
+ * Database schema (moz_cookies table):
+ *   id, originAttributes, name, value, host, path, expiry,
+ *   lastAccessed, creationTime, isSecure, isHttpOnly,
+ *   inBrowserElement, sameSite, rawSameSite, schemeMap
+ *
+ * Note: expiry is Unix seconds, but lastAccessed/creationTime are microseconds.
+ *
+ * Firefox holds an exclusive WAL lock while running, so we copy the database
+ * files (cookies.sqlite + WAL + SHM) to a temp directory before reading.
+ */
+export interface FirefoxCookie {
+    name: string;
+    value: string;
+    domain: string;
+    path: string;
+    expires: number;
+    secure: boolean;
+    httpOnly: boolean;
+    sameSite: 'None' | 'Lax' | 'Strict';
+}
+interface FirefoxProfile {
+    name: string;
+    path: string;
+    isRelative: boolean;
+    isDefault: boolean;
+}
+/**
+ * List available Firefox profiles
+ */
+export declare function listFirefoxProfiles(): FirefoxProfile[];
+/**
+ * Import cookies from Firefox's cookies.sqlite database
+ */
+export declare function importFirefoxCookies(options?: {
+    profile?: string;
+    domain?: string;
+}): FirefoxCookie[];
+/**
+ * Convert FirefoxCookie to Playwright cookie format
+ */
+export declare function toPlaywrightCookie(cookie: FirefoxCookie): {
+    name: string;
+    value: string;
+    domain: string;
+    path: string;
+    expires: number;
+    secure: boolean;
+    httpOnly: boolean;
+    sameSite: 'Strict' | 'Lax' | 'None';
+};
+export {};
+//# sourceMappingURL=firefox.d.ts.map