Add custom on-screen keyboard feature and fix installation

- Added custom half-width on-screen keyboard widget (keyboard_widget.py)
- Keyboard appears at bottom center when input fields are active
- Integrated keyboard in exit popup and settings popup
- Fixed install.sh: added --break-system-packages flag for pip3
- Fixed install.sh: added fallback to online installation for version mismatches
- Removed old Kivy 2.1.0 tar.gz that was causing conflicts
- Keyboard includes close button for intuitive dismissal
- All input fields trigger keyboard on touch
- Keyboard automatically cleans up on popup dismiss

install.sh

@@ -83,13 +83,18 @@ if [ "$OFFLINE_MODE" = true ] && [ -d "$WHEELS_DIR" ] && [ "$(ls -A $WHEELS_DIR/
     echo "Installing from offline Python wheels..."
     echo "Wheel files found: $(ls -1 $WHEELS_DIR/*.whl 2>/dev/null | wc -l)"
     
-    pip3 install --no-index --find-links="$WHEELS_DIR" -r requirements.txt
-    
-    echo "Python packages installed from offline repository"
+    if pip3 install --break-system-packages --no-index --find-links="$WHEELS_DIR" -r requirements.txt 2>&1 | tee /tmp/pip_install.log; then
+        echo "Python packages installed from offline repository"
+    else
+        echo "Warning: Offline installation failed (possibly due to Python version mismatch)"
+        echo "Falling back to online installation..."
+        pip3 install --break-system-packages -r requirements.txt
+        echo "Python packages installed from PyPI"
+    fi
 else
     # Online: Use pip from PyPI
     echo "Installing from PyPI..."
-    pip3 install -r requirements.txt
+    pip3 install --break-system-packages -r requirements.txt
     
     echo "Python packages installed successfully"
 fi