Initial commit: Screen Leads app

Screen-capture lead tool: capture agent, Claude vision extractor with
pluggable site recipes (LinkedIn), canonical funnel model, SQLite storage,
FastAPI backend, dashboard, and setup/run scripts.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

agent/platform/windows.py

@@ -0,0 +1,24 @@
+"""Windows: reliably reading a browser's address-bar URL needs UI Automation
+(pywinauto/uiautomation). We attempt a lightweight UIA read if available and
+otherwise return None, letting the detector fall back to visual address-bar
+reading from the screenshot.
+"""
+from typing import Optional
+
+
+def get_active_tab_url() -> Optional[str]:
+    try:
+        import uiautomation as auto  # optional dependency
+    except Exception:
+        return None
+    try:
+        window = auto.GetForegroundControl()
+        # Chromium/Firefox expose the address bar as an Edit control named
+        # "Address and search bar" / "Search or enter address".
+        edit = window.EditControl(searchDepth=12)
+        if edit.Exists(0.3):
+            val = (edit.GetValuePattern().Value or "").strip()
+            return val or None
+    except Exception:
+        return None
+    return None