Rebuild .exe with CEF + win32gui fixes

- Updated build.spec with win32gui/win32con hidden imports
- Updated requirements_win.txt with cefpython3 docs
- Rebuilt .exe at 2026-07-24 14:41 (143 MB with CEF)
- All 12 resources bundled (icons, intro1.mp4)
- development-track.md updated with BUG-007, BUG-008

windows/build.spec

@@ -101,6 +101,9 @@ hidden_imports = [
     'glob',
     'selectors',
     'tempfile',
+    # Windows-specific
+    'win32gui',
+    'win32con',
 ]
 
 # Exclude Linux-only modules
@@ -131,7 +134,9 @@ if kv_file.exists():
     kv_data.append((str(kv_file), '.'))
 
 # Bundle the entire src directory as a tree
-source_tree = Tree(str(SRC_DIR), prefix='', excludes=['*.pyc', '__pycache__', '*.ini'])
+source_tree = Tree(str(SRC_DIR), prefix='')
+# Filter out pyc files, pycache dirs, and ini files
+source_tree.excludes = ['*.pyc', '__pycache__', '*.ini']
 
 # --- Collect binary DLLs from kivy_deps and ffpyplayer ----------------
 import importlib.util