feat(codebase): smart auto-expand logic for Next.js and React project structures

vibn-frontend/components/project/gitea-file-tree.tsx

@@ -111,13 +111,64 @@ export function GiteaFileTree({
       .then(async (items) => {
         if (cancelled) return;
 
-        // Auto-expand top-level directories so the tree doesn't look empty
-        const dirs = items.filter((i) => i.type === "dir").map((i) => i.path);
         const newChildrenByPath: Record<string, TreeItem[]> = {};
         const newExpanded = new Set<string>();
 
-        // Cap at 10 to avoid API spam on huge repos
+        const rootDirs = items.filter((i) => i.type === "dir");
-        const dirsToExpand = dirs.slice(0, 10);
+        const rootDirNames = rootDirs.map((i) => i.name);
+
+        const hasSrc = rootDirNames.includes("src");
+        const hasAppOrComponents =
+          rootDirNames.includes("app") ||
+          rootDirNames.includes("components") ||
+          rootDirNames.includes("pages");
+
+        if (hasSrc || hasAppOrComponents) {
+          // Smart default: expand app/components/pages, and src -> app/components/pages
+          if (hasSrc) {
+            const srcItem = rootDirs.find((i) => i.name === "src")!;
+            try {
+              const srcItems = await fetchPath(srcItem.path);
+              newChildrenByPath[srcItem.path] = srcItems;
+              newExpanded.add(srcItem.path);
+
+              const srcDirs = srcItems.filter((i) => i.type === "dir");
+              const subPromises = [];
+              for (const target of ["app", "components", "pages", "lib"]) {
+                const subItem = srcDirs.find((i) => i.name === target);
+                if (subItem) {
+                  subPromises.push(
+                    fetchPath(subItem.path).then((children) => {
+                      newChildrenByPath[subItem.path] = children;
+                      newExpanded.add(subItem.path);
+                    }),
+                  );
+                }
+              }
+              await Promise.all(subPromises);
+            } catch (e) {
+              console.warn(`[gitea-file-tree] failed to auto-expand src`);
+            }
+          }
+
+          if (hasAppOrComponents) {
+            const subPromises = [];
+            for (const target of ["app", "components", "pages", "lib"]) {
+              const rootItem = rootDirs.find((i) => i.name === target);
+              if (rootItem) {
+                subPromises.push(
+                  fetchPath(rootItem.path).then((children) => {
+                    newChildrenByPath[rootItem.path] = children;
+                    newExpanded.add(rootItem.path);
+                  }),
+                );
+              }
+            }
+            await Promise.all(subPromises);
+          }
+        } else {
+          // Fallback: auto-expand up to 10 top-level directories so it doesn't look empty
+          const dirsToExpand = rootDirs.map((i) => i.path).slice(0, 10);
           await Promise.all(
             dirsToExpand.map(async (dirPath) => {
               try {
@@ -131,6 +182,7 @@ export function GiteaFileTree({
               }
             }),
           );
+        }
 
         if (cancelled) return;