fix(electrobun): native folder picker dialog replaces inline PathBrowser

- Uses Electrobun's Utils.openFileDialog (canChooseDirectory: true)
- files.pickDirectory + files.homeDir RPC handlers
- ProjectWizard: 📂 button opens native OS dialog
- Removed broken inline PathBrowser (process.env.HOME not in WebView)

ui-electrobun/src/mainview/ProjectWizard.svelte

@@ -210,10 +210,22 @@
 
   function handleBrowserSelect(path: string) {
     localPath = path;
-    showBrowser = false;
     validatePath(path);
   }
 
+  async function handleNativeBrowse() {
+    try {
+      const result = await appRpc.request['files.pickDirectory']({ startingFolder: localPath || '~/' });
+      if (result?.path) {
+        localPath = result.path;
+        validatePath(result.path);
+      }
+    } catch {
+      // Fallback: native dialog not available, user types path manually
+      console.warn('[wizard] Native folder picker not available');
+    }
+  }
+
   // Validation indicator
   function validationIcon(state: typeof pathValid): string {
     switch (state) {
@@ -280,16 +292,13 @@
               placeholder={t('wizard.step1.pathPlaceholder' as any)}
               bind:value={localPath}
               oninput={() => validatePath(localPath)} />
-            <button class="wz-browse-btn" onclick={() => showBrowser = !showBrowser}
-              aria-label={t('wizard.step1.browse' as any)}>🔍</button>
+            <button class="wz-browse-btn" onclick={handleNativeBrowse}
+              aria-label={t('wizard.step1.browse' as any)}>📂</button>
             {#if pathValid !== 'idle'}
               <span class="wz-validation" style:color={validationColor(pathValid)}>
                 {validationIcon(pathValid)}
               </span>
             {/if}
-            {#if showBrowser}
-              <PathBrowser onSelect={handleBrowserSelect} onClose={() => showBrowser = false} />
-            {/if}
           </div>
           {#if pathValid === 'valid' && isGitRepo}
             <span class="wz-badge git-badge">{t('wizard.step1.gitDetected' as any)} ({gitBranch})</span>