feat: use Telegram native Rich Message for assistant replies

Co-authored-by: MuziIsabel <MuziIsabel@users.noreply.github.com>

lib/bridge.js

@@ -5,6 +5,7 @@ import { catalogFromLiveAgents, loadCatalog, truncateButton, visibleSessionsForW
 import { TelegramClient, } from './client.js';
 import { MSG, LAST_CB, parseCommand } from './commands.js';
 import { markdownToHtml, splitMessage } from './format.js';
+import { splitRichMarkdown } from './rich-format.js';
 import { formatLastTurn, loadLastTurn } from './history.js';
 import { describeAgent, displayLabel } from './label.js';
 import { formatModel, loadSessionModels, selectSessionModel, } from './models.js';
@@ -28,6 +29,10 @@ function contentToText(content) {
         .map((block) => block.text)
         .join('');
 }
+function isRichUnsupportedError(err) {
+    const message = err instanceof Error ? err.message : String(err);
+    return /method not found|unknown method|not found|404|bad request|can't parse|rich message/i.test(message);
+}
 export class TelegramBridge {
     ctx;
     token;
@@ -36,6 +41,7 @@ export class TelegramBridge {
     client;
     sleep;
     maxMessageLength;
+    renderingMode;
     bindings = new Map();
     pickers = new Map();
     /** chatId → model awaiting reasoning-effort pick (kept outside picker so list refreshes won't drop it). */
@@ -55,6 +61,7 @@ export class TelegramBridge {
         });
         this.sleep = options.sleep ?? defaultSleep;
         this.maxMessageLength = options.maxMessageLength ?? 4096;
+        this.renderingMode = options.rendering === 'html' ? 'html' : 'rich';
     }
     start() {
         this.disposeSessionListener?.();
@@ -603,6 +610,29 @@ export class TelegramBridge {
         }
     }
     async deliver(chatId, markdown) {
+        if (this.renderingMode === 'html') {
+            await this.deliverHtml(chatId, markdown);
+            return;
+        }
+        let sentAny = false;
+        try {
+            const chunks = splitRichMarkdown(markdown);
+            for (const chunk of chunks) {
+                await this.client.sendRichMessage(chatId, chunk);
+                sentAny = true;
+            }
+        }
+        catch (err) {
+            if (!sentAny && isRichUnsupportedError(err)) {
+                this.ctx.logger.warn('dsh-telegram-channel: Rich Message API unavailable, falling back to HTML rendering');
+                this.renderingMode = 'html';
+                await this.deliverHtml(chatId, markdown);
+                return;
+            }
+            this.ctx.logger.error(this.redact(err));
+        }
+    }
+    async deliverHtml(chatId, markdown) {
         const chunks = splitMessage(markdown, this.maxMessageLength);
         for (const chunk of chunks) {
             const html = markdownToHtml(chunk);