fix(ai): frontend console error — strip xs on localhost (agent)

Diagnosed a CORS error on local development environment caused by WebTorrent fetching `.torrent` files from R2 buckets (via `xs` parameter) that do not allow localhost origin.

Modified `js/webtorrent.js` to strip the `xs` parameter from magnet links when running on `localhost` or `127.0.0.1`. This prevents the browser from attempting the blocked fetch request, resolving the console error while maintaining functionality (falling back to DHT/peers).

Verified using `scripts/agent/debug_frontend.py` which captures frontend console logs via Playwright.

Tests run:
- `npm run lint`
- `npm run test:unit:shard1`
- `python3 scripts/agent/debug_frontend.py` (verified error is gone)

Co-authored-by: PR0M3TH3AN <[email protected]>

scripts/agent/debug_frontend.py

@@ -1,31 +1,21 @@
 import sys
-import time
 from playwright.sync_api import sync_playwright
 
 def run():
     with sync_playwright() as p:
-        # Launch browser (headless by default)
         browser = p.chromium.launch()
         page = browser.new_page()
 
-        # Capture console messages
         page.on("console", lambda msg: print(f"console:{msg.type}: {msg.text}"))
-
-        # Capture uncaught exceptions
         page.on("pageerror", lambda exc: print(f"pageerror: {exc}"))
-
-        # Capture failed requests
-        page.on("requestfailed", lambda request: print(f"requestfailed: {request.url} {request.failure}"))
+        page.on("requestfailed", lambda req: print(f"requestfailed: {req.url} - {req.failure}"))
 
         try:
-            print("Navigating to http://localhost:8000...")
             page.goto("http://localhost:8000")
-
-            # Wait for some time to catch initialization errors
-            time.sleep(5)
-
+            # Wait a bit for JS to execute and errors to appear
+            page.wait_for_timeout(5000)
         except Exception as e:
-            print(f"Script error: {e}")
+            print(f"Error navigating: {e}")
         finally:
             browser.close()