fix(simu): use local time rather than UTC in the WASM simulator (#7658)

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

web/src/App.svelte

@@ -448,7 +448,8 @@
       ex.simuInit();
       runner.setFatfsPaths('/', '/');
       ex.simuCreateDefaults();
-      ex.simuStart(1);
+      // WASI has no timezone support, so the module needs our UTC offset.
+      ex.simuStart(1, -new Date().getTimezoneOffset() * 60);
 
       if (canvas) {
         lcdRenderer = new LcdRenderer(canvas);

web/src/lib/wasm-runner.ts

@@ -45,7 +45,7 @@ export interface SimulatorExports {
   free: (ptr: number) => void;
 
   simuInit: () => void;
-  simuStart: (tests: number) => void;
+  simuStart: (tests: number, utcOffset: number) => void;
   simuStop: () => void;
   simuIsRunning: () => number;
   simuFatfsSetPaths: (sdPath: number, settingsPath: number) => void;