feat: add live Discord sharing functionality with dynamic habit progress images

- Implemented live card image generation for user habits using canvas.
- Created API endpoints for starting and managing live Discord sharing sessions.
- Added tests for live Discord sharing to ensure functionality and reliability.
- Introduced CSS styles for the live Discord sharing interface.
- Enhanced error handling and state management for Discord message updates.

src/db/schema.ts

@@ -84,3 +84,18 @@ export const reminderDeliveries = sqliteTable('reminder_deliveries', {
 export const reminderWorkerState = sqliteTable('reminder_worker_state', {
   id: text('id').primaryKey(), blockedUntil: integer('blocked_until').notNull(),
 });
+
+export const liveDiscordCards = sqliteTable('live_discord_cards', {
+  userId: text('user_id').primaryKey().references(() => users.id, { onDelete: 'cascade' }),
+  channelId: text('channel_id').notNull(),
+  messageId: text('message_id'),
+  messageUrl: text('message_url'),
+  nonce: text('nonce').notNull(),
+  theme: text('theme').$type<import('../lib/theme').Theme>().notNull(),
+  status: text('status').$type<'active' | 'paused' | 'sending' | 'uncertain' | 'error'>().notNull(),
+  imageHash: text('image_hash'),
+  dirty: integer('dirty', { mode: 'boolean' }).notNull().default(true),
+  error: text('error'),
+  retryAt: integer('retry_at'),
+  updatedAt: integer('updated_at').notNull(),
+});