fix: use collect_all for mysql.connector to fix No module named 'mysql' in exe

mysql-connector-python 9.x restructured its package hierarchy. PyInstaller
fails to auto-discover submodules (aio, plugins, locales, etc.).
Updated DatabaseApp.spec to use collect_all('mysql.connector') which
walks the full package tree and bundles all required files.
Rebuilt DatabaseApp.exe (30.9 MB).

DatabaseApp.spec

@@ -1,12 +1,22 @@
 # -*- mode: python ; coding: utf-8 -*-
+from PyInstaller.utils.hooks import collect_all
 
+mysql_datas, mysql_binaries, mysql_hiddenimports = collect_all('mysql.connector')
 
 a = Analysis(
     ['main.py'],
     pathex=[],
-    binaries=[],
-    datas=[],
-    hiddenimports=['mysql.connector', 'mysql.connector.locales', 'mysql.connector.locales.eng', 'mysql.connector.plugins', 'mysql.connector.plugins.mysql_native_password', 'kivy.core.window.window_sdl2', 'win32timezone'],
+    binaries=mysql_binaries,
+    datas=mysql_datas,
+    hiddenimports=mysql_hiddenimports + [
+        'mysql', 'mysql.connector', 'mysql.connector.locales',
+        'mysql.connector.locales.eng', 'mysql.connector.locales.eng.client_error',
+        'mysql.connector.plugins', 'mysql.connector.plugins.mysql_native_password',
+        'mysql.connector.plugins.caching_sha2_password',
+        'mysql.connector.aio', 'mysql.connector.aio.plugins',
+        'mysql.connector.aio.plugins.mysql_native_password',
+        'kivy.core.window.window_sdl2', 'win32timezone',
+    ],
     hookspath=[],
     hooksconfig={},
     runtime_hooks=[],