refactor: externalize local folder watch marker

rust/crates/mnote-web/src/ssr/pages/layout.rs

@@ -2442,6 +2442,14 @@ const SIDEBAR_TREE_JS: &str = r##"
     return applied;
   }
 
+  function markLocalFolderWatchApplied(value) {
+    var runtimeFn = fileTreeRuntimeFunction('markLocalFolderWatchApplied');
+    if (runtimeFn) return runtimeFn(value);
+    var appliedValue = String(value || 'projection');
+    document.documentElement.setAttribute('data-mnote-local-folder-watch-applied', appliedValue);
+    return true;
+  }
+
   async function refreshLocalFolderSidebarSnapshot() {
     var workspaceId = currentWorkspaceId();
     var rootUri = currentRootUri();
@@ -2474,7 +2482,7 @@ const SIDEBAR_TREE_JS: &str = r##"
     schedulePendingLocalFolderRestoreFocus();
     restoreSidebarTreeTab();
     refreshEditorLocalAttachmentExistence();
-    document.documentElement.setAttribute('data-mnote-local-folder-watch-applied', 'projection');
+    markLocalFolderWatchApplied('projection');
     return true;
   }
 
@@ -11111,6 +11119,7 @@ mod tests {
         assert!(
             SIDEBAR_TREE_JS.contains("fileTreeRuntimeFunction('applyLocalFolderSidebarSnapshot')")
         );
+        assert!(SIDEBAR_TREE_JS.contains("fileTreeRuntimeFunction('markLocalFolderWatchApplied')"));
         let document_id_body = js_function_body(SIDEBAR_TREE_JS, "fileTreeRowDocumentId");
         assert!(
             document_id_body.contains("data-document-id")
@@ -11131,6 +11140,12 @@ mod tests {
                 && apply_body.contains("replaceSidebarTreeFromDocument(nextDocument, fileRootId)"),
             "inline fallback 必须保留 sidebar/page tree DOM 应用行为"
         );
+        let watch_applied_body = js_function_body(SIDEBAR_TREE_JS, "markLocalFolderWatchApplied");
+        assert!(
+            watch_applied_body.contains("data-mnote-local-folder-watch-applied")
+                && watch_applied_body.contains("String(value || 'projection')"),
+            "inline fallback 必须保留 local folder watch projection 标记"
+        );
     }
 
     #[test]
@@ -11161,12 +11176,15 @@ mod tests {
         assert!(FILETREE_RUNTIME_JS.contains("function groupRowsByParent"));
         assert!(FILETREE_RUNTIME_JS.contains("function replaceSidebarTreeFromDocument"));
         assert!(FILETREE_RUNTIME_JS.contains("function applyLocalFolderSidebarSnapshot"));
+        assert!(FILETREE_RUNTIME_JS.contains("function markLocalFolderWatchApplied"));
         assert!(FILETREE_RUNTIME_JS.contains("appendUploadedAssetRow: appendUploadedAssetRow"));
         assert!(FILETREE_RUNTIME_JS.contains("groupRowsByParent: groupRowsByParent"));
         assert!(FILETREE_RUNTIME_JS
             .contains("replaceSidebarTreeFromDocument: replaceSidebarTreeFromDocument"));
         assert!(FILETREE_RUNTIME_JS
             .contains("applyLocalFolderSidebarSnapshot: applyLocalFolderSidebarSnapshot"));
+        assert!(FILETREE_RUNTIME_JS
+            .contains("markLocalFolderWatchApplied: markLocalFolderWatchApplied"));
         assert!(FILETREE_RUNTIME_JS
             .contains("uploadIntent: String(detail.uploadIntent || 'filetree.folder.drop')"));
         assert!(FILETREE_RUNTIME_JS