fix: hexagon coordinate view tweaks (#2250)

- Remove hex.creature.xray() call in showGrid() so units remain fully visible (no longer tedious x-ray mode)
- Add 'dashed' visual state for empty (non-unit) hexes when showGrid is active, displaying a dashed grid overlay
- Set empty dashed hexes to 25% opacity when showGrid is active per issue spec
- Occupied hexes: creature sprite visible below, coordinates display in overlayHexesGroup (above creatures)
- Empty hexes: dashed hex at 25% opacity with coordinates on top in overlayHexesGroup

Changes:
- src/utility/hexgrid.ts: Modified showGrid() - removed xray call, added dashed class for empty hexes
- src/utility/hex.ts: Modified display() - set empty dashed hexes to 25% alpha when showGrid active

Bounty: 7 XTR
收款地址：eB51DWp1uECrLZRLsE2cnyZUzfRWvzUzaJzkatTpQV9

Author: sungdark

src/utility/hex.ts

@@ -581,6 +581,10 @@ export class Hex {
 				this.grid.displayHexesGroup.bringToTop(this.display);
 			} else {
 				this.display.loadTexture('hex_dashed');
+				// When showGrid is active on empty hexes, show dashed at 25% opacity
+				if (this.displayClasses.match(/showGrid/g)) {
+					this.display.alpha = 0.25;
+				}
 			}
 		} else if (this.displayClasses.match(/deadzone/)) {
 			this.display.loadTexture('hex_deadzone');

src/utility/hexgrid.ts

@@ -1456,18 +1456,19 @@ export class HexGrid {
 
 	showGrid(val) {
 		this.forEachHex((hex) => {
-			if (hex.creature) {
-				hex.creature.xray(val);
-			}
-
 			if (hex.drop) {
 				return;
 			}
 
 			if (val) {
 				hex.displayVisualState('showGrid');
+				// Show dashed grid (not x-ray) for empty hexes so coordinates are visible on top of units
+				if (!hex.creature) {
+					hex.displayVisualState('dashed');
+				}
 			} else {
 				hex.cleanDisplayVisualState('showGrid');
+				hex.cleanDisplayVisualState('dashed');
 			}
 		});
 	}