fix: send new message if edit_text fails silently in /process

If the bot restarted between sending the progress message and the
completion callback, edit_text may fail silently (Conflict/stale ref).
Store completion text and reply_text as fallback so the user always
sees the result.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/bot/bot.py

@@ -465,21 +465,28 @@ async def cmd_process(update: Update, ctx: ContextTypes.DEFAULT_TYPE):
 
         processor = ContentProcessor(db, ollama)
 
+        completion_text = None
+
         async def proc_progress(total_chunks, total_words):
-            try:
+            nonlocal completion_text
-                await msg.edit_text(
+            completion_text = (
                 f"🧠 *Processing complete!*\n"
                 f"• Chunks stored: `{total_chunks}`\n"
                 f"• Words researched: `{total_words:,}`\n\n"
-                    f"Ready! Use `/generate podcast|blog|report|thread`\n"
+                f"Ready! Use `/generate podcast|blog|report|thread`"
-                    f"_If 0 chunks: set `QUALITY_THRESHOLD=0.3` or `0` and retry_",
-                    parse_mode=ParseMode.MARKDOWN
             )
+            try:
+                await msg.edit_text(completion_text, parse_mode=ParseMode.MARKDOWN)
+                completion_text = None  # sent, no need to resend
             except Exception:
                 pass
 
         await processor.process_session(session_id, topic, proc_progress)
 
+        # Fallback: if edit_text failed silently, send a new message
+        if completion_text:
+            await update.message.reply_text(completion_text, parse_mode=ParseMode.MARKDOWN)
+
     except Exception as e:
         logger.error("Process command failed", error=str(e))
         await update.message.reply_text(f"❌ Processing failed: {str(e)[:200]}")