feat: add portable Windows zone manager

fancywin.example.yaml

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+# FancyWin configuration. Percentages are relative to each monitor's usable
+# work area, so the Windows taskbar is automatically excluded.
+version: 1
+gap: 8
+shift_drag: true
+
+overlay:
+  enabled: true
+  color: "#00AEEF"
+  opacity: 90
+  border_width: 3
+
+layouts:
+  # The wildcard is used for any monitor without a more specific entry.
+  - monitor: "*"
+    zones:
+      - name: left
+        x: 0
+        y: 0
+        width: 25
+        height: 100
+      - name: middle
+        x: 25
+        y: 0
+        width: 50
+        height: 100
+      - name: right
+        x: 75
+        y: 0
+        width: 25
+        height: 100
+
+  # Optional per-display override. Get the name from Windows Display Settings
+  # or the startup diagnostics, then uncomment and edit this block.
+  # - monitor: '\\.\DISPLAY2'
+  #   zones:
+  #     - { name: main, x: 0, y: 0, width: 70, height: 100 }
+  #     - { name: side, x: 70, y: 0, width: 30, height: 100 }
+
+excluded_apps:
+  - mstsc.exe
+  - games
+
+hotkeys:
+  - { keys: "win+alt+left", action: previous_zone }
+  - { keys: "win+alt+right", action: next_zone }
+  - { keys: "win+alt+1", action: zone_1 }
+  - { keys: "win+alt+2", action: zone_2 }
+  - { keys: "win+alt+3", action: zone_3 }