Add Use Spot Overlay and Target Capture Bar functionality

- Introduced `StageUseTargetCaptureBar` class for managing user interactions with props and their use spots.
- Implemented UI elements including buttons for changing props and canceling actions.
- Added `PropUseSpotData` class for validation and serialization of prop use spots.
- Created tests for validating use spot data migration, serialization, and rule matching.
- Ensured proper handling of edge cases in use spot data, including unique IDs and finite positions.

sandbox_theme.json

@@ -176,6 +176,17 @@
       "stickman_cue_color": "#F5F7FA",
       "prop_cue_color": "#B7824D",
       "cue_outline_color": "#171B24"
+    },
+    "spots": {
+      "row_gap": 8,
+      "pin_visual_size": 30,
+      "pin_hit_size": 44,
+      "pin_outline_width": 2,
+      "focus_ring_width": 3,
+      "name_pill_padding": 10,
+      "pin_surface_color": "#F4F7FB",
+      "pin_outline_color": "#171B24",
+      "completion_duration": 0.6
     }
   },
   "overlays": {
@@ -183,6 +194,8 @@
     "terrain_guide": { "color": "#22C6FF" },
     "completed_path_alpha": 0.2,
     "completed_path_color": "#959EAD",
+    "rule_connector_color": "#AAB2C0",
+    "rule_action_color": "#7E57C2",
     "valid": { "color": "#4DE66680" },
     "same_type": { "color": "#FFFFFF26" },
     "invalid": { "color": "#FF4D4D80" },
@@ -190,6 +203,13 @@
       "unknown_color": "#C5CAD4",
       "reach_color": "#FFB300",
       "ghost_alpha": 0.36
+    },
+    "use_preview": {
+      "valid_color": "#42D887",
+      "invalid_color": "#F06464",
+      "uncertain_color": "#FFB300",
+      "neutral_color": "#C5CAD4",
+      "completion_duration": 0.6
     }
   },
   "widgets": {