Add textarea fallback for CodeMirror initialization failures and fix module dependency conflicts with import map

frontend/app.js

@@ -16,6 +16,7 @@
   let editorView = null;
   let editorVault = null;
   let editorPath = null;
+  let fallbackEditorEl = null;
 
   // ---------------------------------------------------------------------------
   // File extension → Lucide icon mapping
@@ -846,41 +847,48 @@
       editorView.destroy();
       editorView = null;
     }
+    fallbackEditorEl = null;
 
-    // Wait for CodeMirror to be available
-    await waitForCodeMirror();
+    try {
+      await waitForCodeMirror();
 
-    const { EditorView, EditorState, basicSetup, markdown, oneDark, keymap } = window.CodeMirror;
+      const { EditorView, EditorState, basicSetup, markdown, oneDark, keymap } = window.CodeMirror;
 
-    // Determine theme
-    const currentTheme = document.documentElement.getAttribute("data-theme");
-    const extensions = [
-      basicSetup,
-      markdown(),
-      keymap.of([{
-        key: "Mod-s",
-        run: () => {
-          saveFile();
-          return true;
-        }
-      }]),
-      EditorView.lineWrapping,
-    ];
+      const currentTheme = document.documentElement.getAttribute("data-theme");
+      const extensions = [
+        basicSetup,
+        markdown(),
+        keymap.of([{
+          key: "Mod-s",
+          run: () => {
+            saveFile();
+            return true;
+          }
+        }]),
+        EditorView.lineWrapping,
+      ];
 
-    if (currentTheme === "dark") {
-      extensions.push(oneDark);
+      if (currentTheme === "dark") {
+        extensions.push(oneDark);
+      }
+
+      const state = EditorState.create({
+        doc: rawData.raw,
+        extensions: extensions,
+      });
+
+      editorView = new EditorView({
+        state: state,
+        parent: bodyEl,
+      });
+    } catch (err) {
+      console.error("CodeMirror init failed, falling back to textarea:", err);
+      fallbackEditorEl = document.createElement("textarea");
+      fallbackEditorEl.className = "fallback-editor";
+      fallbackEditorEl.value = rawData.raw;
+      bodyEl.appendChild(fallbackEditorEl);
     }
 
-    const state = EditorState.create({
-      doc: rawData.raw,
-      extensions: extensions,
-    });
-
-    editorView = new EditorView({
-      state: state,
-      parent: bodyEl,
-    });
-
     modal.classList.add("active");
     safeCreateIcons();
   }
@@ -903,14 +911,15 @@
       editorView.destroy();
       editorView = null;
     }
+    fallbackEditorEl = null;
     editorVault = null;
     editorPath = null;
   }
 
   async function saveFile() {
-    if (!editorView || !editorVault || !editorPath) return;
+    if ((!editorView && !fallbackEditorEl) || !editorVault || !editorPath) return;
 
-    const content = editorView.state.doc.toString();
+    const content = editorView ? editorView.state.doc.toString() : fallbackEditorEl.value;
     const saveBtn = document.getElementById("editor-save");
     const originalText = saveBtn.textContent;