refactor(display): extract tile layout logic to library helper class

libraries/KlubhausCore/src/ScreenState.h

@@ -16,19 +16,35 @@ enum class TileAction {
     REBOOT,   // Reboot device
 };
 
+/// Dashboard tile layout constraints for flexible grid
+struct TileConstraint {
+    uint8_t minCols = 1;    // minimum columns this tile needs
+    uint8_t minRows = 1;    // minimum rows this tile needs
+    uint8_t weight = 1;     // priority for growing/shrinking (higher = more flexible)
+};
+
+/// Computed tile position in the grid
+struct TileLayout {
+    int x, y;       // pixel position
+    int w, h;       // pixel size
+    int col, row;   // grid position
+    int cols, rows; // grid span
+};
+
 /// Dashboard tile definitions — shared across all boards
 struct DashboardTile {
     const char* label;
     uint16_t bgColor; // RGB565
     TileAction action;
+    TileConstraint constraint;
 };
 
-/// Standard dashboard tiles (auto-gridded based on count)
+/// Standard dashboard tiles (auto-gridded based on count and constraints)
 static constexpr DashboardTile DASHBOARD_TILES[] = {
-    { "Alert",  0x0280, TileAction::ALERT },
-    { "Silent", 0x0400, TileAction::SILENCE },
-    { "Status", 0x0440, TileAction::STATUS },
-    { "Reboot", 0x0100, TileAction::REBOOT },
+    { "Alert",  0x0280, TileAction::ALERT, {1, 1, 1} },
+    { "Silent", 0x0400, TileAction::SILENCE, {1, 1, 1} },
+    { "Status", 0x0440, TileAction::STATUS, {1, 1, 1} },
+    { "Reboot", 0x0100, TileAction::REBOOT, {1, 1, 1} },
 };
 static constexpr int DASHBOARD_TILE_COUNT = sizeof(DASHBOARD_TILES) / sizeof(DASHBOARD_TILES[0]);