feat: enhance Appwrite integration and chat functionality

- Added support for encrypted coach chats with a new `coach_chats` collection in the Appwrite database.
- Updated `.env.example` to include `OLLAMA_API_KEY`, `OLLAMA_MODEL`, and `APPWRITE_API_KEY` for server-side configurations.
- Introduced a setup script in `package.json` for initializing Appwrite database tables.
- Enhanced the Vite configuration to proxy requests to the Ollama API.
- Updated the main application structure to accommodate new chat features and improved theme management.
- Refined CSS styles for better UI consistency and added new components for chat functionality.

src/types.ts

@@ -54,3 +54,23 @@ export type ImportPreview = {
   fileName: string;
   rows: ImportPreviewRow[];
 };
+
+export type ChatRole = "user" | "assistant";
+
+export type CoachMessage = {
+  id: string;
+  role: ChatRole;
+  content: string;
+  thinking?: string;
+  pending?: boolean;
+  stopped?: boolean;
+};
+
+export type CoachChat = {
+  id: string;
+  userId: string;
+  title: string;
+  messages: CoachMessage[];
+  createdAt: string;
+  updatedAt: string;
+};