feat: add download ZIP and push to GitHub features, fix code overflow in chat

lib/store.ts

@@ -34,6 +34,7 @@ interface AppState {
     refreshToken?: string;
     expiresAt?: number;
   } | null;
+  githubToken?: string | null;
   isProcessing: boolean;
   error: string | null;
   history: {
@@ -65,6 +66,7 @@ interface AppState {
   setAvailableModels: (provider: ModelProvider, models: string[]) => void;
   setApiKey: (provider: ModelProvider, key: string) => void;
   setQwenTokens: (tokens?: { accessToken: string; refreshToken?: string; expiresAt?: number } | null) => void;
+  setGithubToken: (token: string | null) => void;
   setProcessing: (processing: boolean) => void;
   setError: (error: string | null) => void;
   addToHistory: (prompt: string) => void;
@@ -107,6 +109,7 @@ const useStore = create<AppState>((set) => ({
     ollama: "",
     zai: "",
   },
+  githubToken: null,
   isProcessing: false,
   error: null,
   history: [],
@@ -174,6 +177,7 @@ const useStore = create<AppState>((set) => ({
       apiKeys: { ...state.apiKeys, [provider]: key },
     })),
   setQwenTokens: (tokens) => set({ qwenTokens: tokens }),
+  setGithubToken: (token) => set({ githubToken: token }),
   setProcessing: (processing) => set({ isProcessing: processing }),
   setError: (error) => set({ error }),
   addToHistory: (prompt) =>