Refactor coach to plain Appwrite storage with integrated overview UI.

Remove client-side encryption, migrate coach_chats schema, fix the Ollama proxy, and embed coach on overview alongside the dedicated tab.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lib/coachChats.ts

@@ -0,0 +1,107 @@
+import type { Models } from "appwrite";
+import type { CoachChat, CoachMessage } from "../types";
+import { appwriteConfig, ID, Permission, Query, Role, tablesDB } from "./appwrite";
+
+type CoachChatRow = Models.Row & {
+  userId: string;
+  title: string;
+  messages: string;
+  updatedAt: string;
+};
+
+export async function listCoachChats(userId: string) {
+  const response = await tablesDB.listRows<CoachChatRow>({
+    databaseId: appwriteConfig.databaseId,
+    tableId: appwriteConfig.chatCollectionId,
+    queries: [Query.equal("userId", userId), Query.orderDesc("updatedAt"), Query.limit(50)],
+  });
+
+  return response.rows.filter(isPlainChatRow).map(fromRow);
+}
+
+export async function createCoachChat(userId: string, chat: CoachChat) {
+  const row = await tablesDB.createRow<CoachChatRow>({
+    databaseId: appwriteConfig.databaseId,
+    tableId: appwriteConfig.chatCollectionId,
+    rowId: ID.custom(chat.id),
+    data: toRowData(userId, chat),
+    permissions: userRowPermissions(userId),
+  });
+
+  return fromRow(row);
+}
+
+export async function updateCoachChat(userId: string, chat: CoachChat) {
+  const row = await tablesDB.updateRow<CoachChatRow>({
+    databaseId: appwriteConfig.databaseId,
+    tableId: appwriteConfig.chatCollectionId,
+    rowId: chat.id,
+    data: toRowData(userId, chat),
+    permissions: userRowPermissions(userId),
+  });
+
+  return fromRow(row);
+}
+
+export async function deleteCoachChat(id: string) {
+  await tablesDB.deleteRow({
+    databaseId: appwriteConfig.databaseId,
+    tableId: appwriteConfig.chatCollectionId,
+    rowId: id,
+  });
+}
+
+export function chatStorageErrorMessage(error: unknown) {
+  if (error instanceof Error) {
+    if (/not found|404/i.test(error.message)) {
+      return `Appwrite chat table '${appwriteConfig.chatCollectionId}' was not found. Run npm run setup:appwrite.`;
+    }
+    if (/permissions?.*create|action 'create'|not authorized|401|unauthorized/i.test(error.message)) {
+      return `Appwrite chat table needs Users -> Create and row security on '${appwriteConfig.chatCollectionId}'.`;
+    }
+    if (/unknown attribute|invalid document structure|missing required attribute/i.test(error.message)) {
+      if (/encrypted/i.test(error.message)) {
+        return "Coach chat table still requires legacy encrypted columns. Run npm run setup:appwrite or remove encryptedTitle, encryptedMessages, titleIv, messagesIv, salt, and version as required in Appwrite Console.";
+      }
+      return "Coach chat schema needs title and messages columns. Run npm run setup:appwrite.";
+    }
+    return error.message;
+  }
+  return "Coach chat storage failed.";
+}
+
+function toRowData(userId: string, chat: CoachChat) {
+  return {
+    userId,
+    title: chat.title.slice(0, 512) || "today",
+    messages: JSON.stringify(chat.messages),
+    updatedAt: chat.updatedAt,
+  };
+}
+
+function isPlainChatRow(row: CoachChatRow) {
+  return typeof row.title === "string" && row.title.length > 0 && typeof row.messages === "string" && row.messages.length > 0;
+}
+
+function fromRow(row: CoachChatRow): CoachChat {
+  let messages: CoachMessage[] = [];
+  try {
+    messages = JSON.parse(row.messages) as CoachMessage[];
+  } catch {
+    messages = [];
+  }
+
+  return {
+    id: row.$id,
+    userId: row.userId,
+    title: row.title,
+    messages,
+    createdAt: row.$createdAt,
+    updatedAt: row.updatedAt || row.$updatedAt,
+  };
+}
+
+function userRowPermissions(userId: string) {
+  const role = Role.user(userId);
+  return [Permission.read(role), Permission.update(role), Permission.delete(role)];
+}