Select/hover tetramino with Area3D signal

TETROMINO_SELECTOR.md

@@ -1,19 +1,22 @@
 # Tetromino Selector System
 
 ## Overview
-Adds interactive tetromino selection and repositioning during gameplay. Players can select already-placed tetrominoes, move them, rotate them, and place them in new positions.
+Adds interactive tetromino selection and repositioning during gameplay. Players can select already-
+placed tetrominoes, move them, rotate them, and place them in new positions.
 
 ## Components
 
 ### 1. TetrominoSelector (scripts/tetromino_selector.gd)
+
 Main controller for tetromino selection logic.
 
 **Features:**
-- Raycast-based tetromino detection on left-click
-- Ghost mode visualization (semi-transparent)
+- Raycast-based tetromino detection on left-click from camera to world
 - Real-time position tracking with mouse movement
-- Rotation with spacebar (45° increments)
+
+- Ghost mode visualization (semi-transparent)
 - Placement validation using board manager
+- Rotation with spacebar (45° increments)
 - Cancellation with right-click or ESC key
 
 **Signals:**
@@ -78,12 +81,12 @@ Added collision detection for raycast selection.
    - Player left-clicks to place
    - Selector validates placement using BoardManager3D._can_place_tetromino()
    - If valid:
-     - Updates board manager occupied cells
-     - Tetromino exits ghost mode
-     - Signals emit `selection_placed`
+	 - Updates board manager occupied cells
+	 - Tetromino exits ghost mode
+	 - Signals emit `selection_placed`
    - If invalid:
-     - Tetromino snaps back to original position
-     - Reverts to original rotation
+	 - Tetromino snaps back to original position
+	 - Reverts to original rotation
 
 5. **Cancellation**
    - Player right-clicks or presses ESC