feat: right-click contrast, Ctrl+saturation, Shift+rotate filters

- Add ColorFilter.matrix (row-major) for saturation and contrast
- Saturation: 0=grayscale, 1=normal, 2=oversaturated (luminance-weighted)
- Contrast: standard contrast matrix (pivot at 0.5)
- Keyboard modifier tracking via HardwareKeyboard.addHandler
- Right-click + vertical drag: contrast (0-2)
- Ctrl + right-click + vertical drag: saturation (0-2)
- Shift + right-click + vertical drag: rotate
- Right double-click: reset all values
- Update install.sh to check debug/ bundle before release/
- Update .deb package with new release build

install.sh

@@ -3,7 +3,11 @@ set -euo pipefail
 
 APP=imajviewer
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
-BUNDLE_DIR="${SCRIPT_DIR}/build/linux/x64/release/bundle"
+BUNDLE_DIR="${SCRIPT_DIR}/build/linux/x64/debug/bundle"
+# Debug yoksa release dene
+if [ ! -f "$BUNDLE_DIR/${APP}" ]; then
+  BUNDLE_DIR="${SCRIPT_DIR}/build/linux/x64/release/bundle"
+fi
 INSTALL_DIR="${HOME}/.local/lib/${APP}"
 BIN_LINK="${HOME}/.local/bin/${APP}"
 DESKTOP_FILE="${HOME}/.local/share/applications/${APP}.desktop"
@@ -24,7 +28,10 @@ if [ ! -f "$BUNDLE_DIR/${APP}" ]; then
   info "Binary bulunamadı, Flutter build başlatılıyor…"
   cd "$SCRIPT_DIR"
   flutter build linux 2>&1 | tail -1 || err "Flutter build başarısız! Sistemde Flutter SDK kurulu olmalı veya dist/imajviewer_*.deb paketini kullanın."
-  BUNDLE_DIR="${SCRIPT_DIR}/build/linux/x64/release/bundle"
+  BUNDLE_DIR="${SCRIPT_DIR}/build/linux/x64/debug/bundle"
+  if [ ! -f "$BUNDLE_DIR/${APP}" ]; then
+    BUNDLE_DIR="${SCRIPT_DIR}/build/linux/x64/release/bundle"
+  fi
   [ -f "$BUNDLE_DIR/${APP}" ] || err "Build başarısız!"
 fi