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 };

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

@@ -6,10 +6,10 @@
 
 #include <Arduino.h>
 #include <KlubhausCore.h>
+#include <Style.h>
 
 // ── Globals ──
 static LGFX* _gfx = nullptr;
-extern DisplayManager display;
 
 // ── Forward declarations ──
 static void initDisplay();
@@ -443,10 +443,11 @@ void DisplayDriverGFX::drawDashboard(const ScreenState& state) {
         },
         safeWifi.w);
 
-    // 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(
+        DISP_W, DISP_H, STYLE_HEADER_HEIGHT, STYLE_TILE_GAP, layouts, &gridCols, &gridRows);
 
     const char* tileLabels[] = { "Alert", "Silent", "Status", "Reboot" };
     const uint16_t tileColors[] = { 0x0280, 0x0400, 0x0440, 0x0100 };

boards/esp32-s3-lcd-43/board-config.sh

@@ -1,4 +1,4 @@
 FQBN="esp32:esp32:waveshare_esp32_s3_touch_lcd_43:PSRAM=enabled,FlashSize=16M,USBMode=hwcdc,PartitionScheme=app3M_fat9M_16MB"
 PORT="/dev/ttyUSB0"
 LIBS="--library ./vendor/esp32-s3-lcd-43/LovyanGFX"
-OPTS="-DDEBUG_MODE -DBOARD_HAS_PSRAM -DLGFX_USE_V1 -DLOCAL_SECRETS"
+OPTS="-DDEBUG_MODE -DBOARD_HAS_PSRAM -DLOCAL_SECRETS"

boards/esp32-s3-lcd-43/esp32-s3-lcd-43.ino

@@ -38,4 +38,7 @@ void loop() {
 
     // Serial console
     logic.processSerial();
+
+    // Yield to WiFi/BT stack
+    delay(LOOP_YIELD_MS);
 }