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.

drizzle/0010_tidy_thena.sql

@@ -0,0 +1,17 @@
+CREATE TABLE `live_discord_cards` (
+	`user_id` text PRIMARY KEY NOT NULL,
+	`channel_id` text NOT NULL,
+	`message_id` text,
+	`message_url` text,
+	`nonce` text NOT NULL,
+	`theme` text NOT NULL,
+	`status` text NOT NULL,
+	`image_hash` text,
+	`dirty` integer DEFAULT true NOT NULL,
+	`error` text,
+	`retry_at` integer,
+	`updated_at` integer NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+DROP TABLE `live_cards`;