Add stamp source hashing and maximize test infrastructure

- Add source hashing to stamp system (functions.sh) for detecting
  when dependencies need rebuild based on source file changes
- Update build-pcbnew.sh to use source stamps for wxWidgets
- Add global-setup.ts to clean logs before test runs
- Add maximize_test standalone test to verify wxFrame::Maximize()
  works correctly in WASM (it does - window is 1280x720)
- Update Makefile.wasm with maximize test build rules

The maximize_test proves wxWidgets display detection works fine.
KiCad's 20x20 window bug is KiCad-specific, not a wxWidgets issue.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/wasm-app/kicad/pcbnew.html

@@ -55,7 +55,7 @@
   </style>
 </head>
 <body style="margin: 0; padding: 0; width: 100%; height: 100%; overflow: hidden; background: #1a1a2e;">
-  <div id="main-window"></div>
+  <div id="main-window" style="width: 100vw; height: 100vh; position: absolute; top: 0; left: 0;"></div>
 
   <div id="status">
     <div id="status-text">Initializing...</div>
@@ -79,8 +79,13 @@
       var canvas = document.createElement('canvas');
       canvas.id = 'canvas';
       canvas.style.display = 'none';
-      canvas.style.width = window.innerWidth + 'px';
-      canvas.style.height = window.innerHeight + 'px';
+      // Set both CSS display size and internal pixel resolution
+      var width = window.innerWidth;
+      var height = window.innerHeight;
+      canvas.width = width;
+      canvas.height = height;
+      canvas.style.width = width + 'px';
+      canvas.style.height = height + 'px';
       canvas.oncontextmenu = function() { event.preventDefault(); };
       canvas.addEventListener("webglcontextlost", function(e) {
         showError('WebGL context lost. You will need to reload the page.');
@@ -90,7 +95,7 @@
       mainWindow.appendChild(canvas);
       Module.canvas = canvas;
 
-      console.log('[KICAD] preRun complete, canvas created');
+      console.log('[KICAD] preRun complete, canvas created: ' + width + 'x' + height);
     };
 
     var onRuntimeInitialized = function() {