Build comprehensive privacy suite and hardened browser controls.

Adds VPN-aware leak handling, chain testing UX improvements, hardened Firefox launch/profile management, privacy/device hardening modules, and tray/status upgrades so the app is production-ready as the new baseline.

Co-authored-by: Cursor <cursoragent@cursor.com>

proxy_chain_manager/gui_validate.py

@@ -0,0 +1,41 @@
+"""Fast parallel proxy checks for the GUI (per-hop callbacks)."""
+from __future__ import annotations
+
+import asyncio
+from typing import Callable
+
+from .validator import _check_one
+
+# High concurrency for interactive chain tests
+GUI_VALIDATE_CONCURRENCY = 48
+
+
+async def validate_each_parallel(
+    urls: list[str],
+    check_url: str,
+    concurrency: int,
+    timeout_seconds: float,
+    on_result: Callable[[str, bool], None],
+) -> None:
+    if not urls:
+        return
+    sem = asyncio.Semaphore(max(1, concurrency))
+
+    async def one(u: str) -> None:
+        async with sem:
+            ok = await _check_one(u, check_url, timeout_seconds)
+        on_result(u, ok)
+
+    await asyncio.gather(*(one(u) for u in urls))
+
+
+def run_validate_each_sync(
+    urls: list[str],
+    check_url: str,
+    timeout_seconds: float,
+    on_result: Callable[[str, bool], None],
+    concurrency: int = GUI_VALIDATE_CONCURRENCY,
+) -> None:
+    asyncio.run(
+        validate_each_parallel(urls, check_url, concurrency, timeout_seconds, on_result)
+    )