feat: implement pwa, add dockerfiles for web and cli, and introduce folder selection with wasm error handling.

webapp/src/App.css

@@ -59,6 +59,33 @@ header h1 {
   text-align: center;
   cursor: pointer;
   transition: all 0.2s ease;
+  position: relative;
+  /* For folder button positioning */
+}
+
+.folder-select-btn {
+  position: absolute;
+  top: 1rem;
+  right: 1rem;
+  background: rgba(255, 255, 255, 0.05);
+  /* Slight visibility */
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  padding: 0.5rem;
+  color: var(--text-muted);
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: all 0.2s ease;
+  z-index: 10;
+}
+
+.folder-select-btn:hover {
+  background: var(--primary);
+  color: white;
+  border-color: var(--primary);
+  transform: scale(1.05);
 }
 
 .dropzone:hover,