refactor: move TileLayoutHelper from DisplayManager.h to Style.h

- Pure static helper class moved from DisplayManager.h to Style.h
- Drivers now use TileLayoutHelper::calculateLayouts() directly
- Remove extern DisplayManager references from display drivers
- Drop LGFX_USE_V1 build flag (no longer needed)
- Add delay(LOOP_YIELD_MS) in S3 loop to prevent watchdog

boards/esp32-32e-4/DisplayDriverTFT.cpp

@@ -3,8 +3,7 @@
 #include <Arduino.h>
 #include <KlubhausCore.h>
 #include <TFT_eSPI.h>
-
-extern DisplayManager display;
+#include <Style.h>
 
 // ── Fonts ───────────────────────────────────────────────────
 // TFT_eSPI built-in fonts for 320x480 display (scaled from 800x480)
@@ -257,10 +256,11 @@ void DisplayDriverTFT::drawDashboard(const ScreenState& st) {
     _tft.setCursor(dispW - wifiW - 10, 20);
     _tft.print(wifiText);
 
-    // Get tile layouts from library helper
-    int tileCount = display.calculateDashboardLayouts(STYLE_HEADER_HEIGHT, STYLE_TILE_GAP);
-    display.setHeaderHeight(STYLE_HEADER_HEIGHT);
-    const TileLayout* layouts = display.getTileLayouts();
+    // Calculate tile layouts using TileLayoutHelper
+    TileLayout layouts[DASHBOARD_TILE_COUNT];
+    int gridCols, gridRows;
+    int tileCount = TileLayoutHelper::calculateLayouts(
+        dispW, dispH, STYLE_HEADER_HEIGHT, STYLE_TILE_GAP, layouts, &gridCols, &gridRows);
 
     const char* tileLabels[] = { "Alert", "Silent", "Status", "Reboot" };
     const uint16_t tileColors[] = { 0x0280, 0x0400, 0x0440, 0x0100 };