Fix Linux crash on input by enforcing XCB and bundling Qt plugins

- Force QT_QPA_PLATFORM='xcb' in [main.py](cci:7://file:///e:/work/KnowEmail/main.py:0:0-0:0) to avoid Wayland input handling issues.
- Update GitHub Actions workflow to use linuxdeploy-plugin-qt, ensuring proper bundling of Qt platform and input plugins for AppImages.
- Resolves issue where application crashes upon typing in text fields on Linux distributions.

Author: Deadpool2000

.github/workflows/build_and_release.yml

@@ -150,12 +150,16 @@ jobs:
           cp AppDir/usr/share/applications/knowemail.desktop AppDir/knowemail.desktop
           cp AppDir/knowemail.png AppDir/.DirIcon
 
+          # --- AppImage ---
           # --- AppImage ---
           wget -q https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
-          chmod +x linuxdeploy-x86_64.AppImage
+          wget -q https://github.com/linuxdeploy/linuxdeploy-plugin-qt/releases/download/continuous/linuxdeploy-plugin-qt-x86_64.AppImage
+          chmod +x linuxdeploy-x86_64.AppImage linuxdeploy-plugin-qt-x86_64.AppImage
           
-          # Run linuxdeploy
-          ./linuxdeploy-x86_64.AppImage --appdir AppDir --output appimage
+          # Run linuxdeploy with Qt plugin
+          # We export the plugin path just in case, though usually it finds it in CWD
+          export PATH=$(pwd):$PATH
+          ./linuxdeploy-x86_64.AppImage --appdir AppDir --plugin qt --output appimage
           
           # Move and Rename AppImage
           mv KnowEmail-*.AppImage dist/KnowEmail-${TAG_NAME}-linux.AppImage

main.py

@@ -1,4 +1,10 @@
 import sys
+import os
+
+# Force XCB on Linux to prevent crashes on Wayland or missing plugin issues
+if sys.platform.startswith('linux'):
+    os.environ['QT_QPA_PLATFORM'] = 'xcb'
+
 from src.gui import EmailValidatorApp
 from PyQt5 import QtWidgets, QtCore
 from PyQt5.QtWidgets import *