electron: external data dir, packaged path fix, footer responsive, test stabilization

- DB + uploads stored outside app bundle (survives updates)
- Router uses DOCUMENT_ROOT instead of __DIR__ (fixes AppImage paths)
- Footer count shifts right below 1250px, min-width 1150px
- Gallery opens gracefully on fetch errors
- Stabilized gallery, export, and find/replace tests with poll loops

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

electron/router.php

@@ -1,9 +1,36 @@
 <?php
 // Router for PHP's built-in server (replaces .htaccess rewrite rules).
 // Static files are served directly; everything else goes to index.php.
+
+// docRoot is set via `php -S ... -t <docRoot>` in main.js
+$docRoot = $_SERVER['DOCUMENT_ROOT'];
+
+// Electron passes HYPRCRD_DATA_DIR so the app stores all user data
+// outside the app bundle (survives updates).
+$dataDir = getenv('HYPRCRD_DATA_DIR');
+if ($dataDir) {
+    define('DB_PATH', $dataDir . '/hyprcrd.db');
+    define('UPLOAD_DIR', $dataDir . '/uploads');
+    if (!is_dir($dataDir . '/uploads')) {
+        mkdir($dataDir . '/uploads', 0755, true);
+    }
+}
+
 $path = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);
-$file = __DIR__ . '/../public' . $path;
+$file = $docRoot . $path;
 if ($path !== '/' && is_file($file)) {
     return false;
 }
-require __DIR__ . '/../public/index.php';
+
+// Serve uploaded files from the external data dir
+if ($dataDir && str_starts_with($path, '/uploads/')) {
+    $extFile = $dataDir . $path;
+    if (is_file($extFile)) {
+        $mime = mime_content_type($extFile) ?: 'application/octet-stream';
+        header('Content-Type: ' . $mime);
+        readfile($extFile);
+        return;
+    }
+}
+
+require $docRoot . '/index.php';