Fix multi-display window detection and click-to-capture; separate Redact tool

Window frames are now converted to AppKit space once at detection time, so
hover highlighting and picking work on every display. A click is only
treated as a drag after 4pt of movement, so clicking a detected window
captures it instead of passing a stray marquee. Redact is now a standalone
tool (Select/Draw/Redact) with its own toolbar hints instead of a toggle
inside the draw bar.

💘 Generated with Crush

Assisted-by: Crush:deepseek-v4-flash-0731

build-app.sh

@@ -108,9 +108,9 @@ cat > "$APP/Contents/Info.plist" <<'PLIST'
     <key>CFBundleIconFile</key>
     <string>Icon</string>
     <key>CFBundleShortVersionString</key>
-    <string>1.5.1</string>
+    <string>1.6.0</string>
     <key>CFBundleVersion</key>
-    <string>51</string>
+    <string>60</string>
     <key>LSUIElement</key>
     <true/>
     <key>NSHighResolutionCapable</key>