added side context panel and repo only search bar

internal/api/handlers/repos.go

@@ -650,3 +650,33 @@ func (h *RepoHandler) lookupRepo(w http.ResponseWriter, r *http.Request) (*model
 	jsonError(w, "repository not found", http.StatusNotFound)
 	return nil, false
 }
+
+// SearchFiles handles GET /repos/{owner}/{repo}/files?q=...&ref=...
+// Returns up to 20 matching file paths (case-insensitive substring match).
+func (h *RepoHandler) SearchFiles(w http.ResponseWriter, r *http.Request) {
+	repo, ok := h.lookupRepo(w, r)
+	if !ok {
+		return
+	}
+
+	query := strings.TrimSpace(r.URL.Query().Get("q"))
+	if query == "" {
+		jsonOK(w, []string{})
+		return
+	}
+
+	ref := r.URL.Query().Get("ref")
+	if ref == "" {
+		ref = repo.DefaultBranch
+	}
+
+	files, err := gitdomain.SearchFiles(repo.DiskPath, ref, query, 20)
+	if err != nil {
+		jsonError(w, "search failed", http.StatusInternalServerError)
+		return
+	}
+	if files == nil {
+		files = []string{}
+	}
+	jsonOK(w, files)
+}