Clean up test infrastructure and fix test assertions

- Replace test.skip() with proper expect() assertions when app fails to load
- Remove button-finder utility (no longer needed with element registry)
- Remove kicad tests (tested separately)
- Add findByName/clickByName helpers for bitmap buttons
- Fix element lookups: use clickByName for bitmap buttons, clickTreeItem
  for treebook pages, selectComboItem for wxChoice items
- Add SetName() to shape buttons in bitmapbuttons_test.cpp
- Remove verbose logging from print and threadpool tests
- Update README to reflect current test infrastructure

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

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

tests/e2e/dialog.spec.ts

@@ -20,10 +20,7 @@ test.describe('wxDialog/wxMessageBox Tests', () => {
   test('Info dialog button can be clicked', async ({ page, testLogger }) => {
     await page.goto('/standalone/dialog/dialog_test.html');
     const loaded = await tryLoadApp(page);
-    if (!loaded) {
-      test.skip();
-      return;
-    }
+    expect(loaded, 'App should load').toBe(true);
 
     await waitForRegistry(page);
 
@@ -43,10 +40,7 @@ test.describe('wxDialog/wxMessageBox Tests', () => {
   test('Yes/No dialog button can be clicked', async ({ page, testLogger }) => {
     await page.goto('/standalone/dialog/dialog_test.html');
     const loaded = await tryLoadApp(page);
-    if (!loaded) {
-      test.skip();
-      return;
-    }
+    expect(loaded, 'App should load').toBe(true);
 
     await waitForRegistry(page);
 
@@ -65,10 +59,7 @@ test.describe('wxDialog/wxMessageBox Tests', () => {
   test('Error dialog button can be clicked', async ({ page, testLogger }) => {
     await page.goto('/standalone/dialog/dialog_test.html');
     const loaded = await tryLoadApp(page);
-    if (!loaded) {
-      test.skip();
-      return;
-    }
+    expect(loaded, 'App should load').toBe(true);
 
     await waitForRegistry(page);
 
@@ -87,10 +78,7 @@ test.describe('wxDialog/wxMessageBox Tests', () => {
   test('Custom dialog button can be clicked', async ({ page, testLogger }) => {
     await page.goto('/standalone/dialog/dialog_test.html');
     const loaded = await tryLoadApp(page);
-    if (!loaded) {
-      test.skip();
-      return;
-    }
+    expect(loaded, 'App should load').toBe(true);
 
     await waitForRegistry(page);