refactor(display): extract dashboard tile grid logic to DisplayManager

boards/esp32-s3-lcd-43/DisplayDriverGFX.cpp

@@ -96,6 +96,22 @@ int DisplayDriverGFX::dashboardTouch(int x, int y) {
     return row * cols + col;
 }
 
+void DisplayDriverGFX::drawTileAt(int x, int y, int w, int h, const char* label, uint16_t bgColor) {
+    // Tile background (use fillRect - LovyanGFX may not have fillRoundRect)
+    _gfx->fillRect(x, y, w, h, bgColor);
+
+    // Tile border
+    _gfx->drawRect(x, y, w, h, 0xFFFF);
+
+    // Tile label
+    _gfx->setTextColor(0xFFFF);
+    _gfx->setTextSize(2);
+    int textLen = strlen(label);
+    int textW = textLen * 12;
+    _gfx->setCursor(x + w/2 - textW/2, y + h/2 - 10);
+    _gfx->print(label);
+}
+
 HoldState DisplayDriverGFX::updateHold(unsigned long holdMs) {
     HoldState state;