feat: human-readable date format with timezone awareness

Add format_due_date() for human-readable dates like "4 April 2026".
Update cmd_add to use timezone-aware date formatting.

Fixes #54

apps/telegram-bot/commands.py

@@ -1,6 +1,8 @@
 """Telegram command handlers for JIGAIDO - Thin wrappers around core services."""
 
 import time
+from datetime import datetime, timezone
+from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 from functools import wraps
 from typing import Optional
 from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
@@ -20,6 +22,36 @@ TRACKING_SERVICE = TrackingService(TRACKING_STORAGE, ROOM_STORAGE)
 TELEGRAM_BOT_USERNAME = "your_bot_username"
 
 
+def format_due_date(due_date_ts: int | None, timezone_str: str) -> str:
+    """Format due date as human-readable with timezone.
+
+    Examples:
+        No due date:     (none shown)
+        Date only:       4 April 2026
+        Date + time:     4 April 2026 14:30
+        With timezone:   4 April 2026 14:30 (Asia/Jakarta)
+    """
+    if not due_date_ts:
+        return ""
+
+    try:
+        tz = ZoneInfo(timezone_str)
+    except (KeyError, ZoneInfoNotFoundError):
+        tz = ZoneInfo("UTC")
+
+    dt = datetime.fromtimestamp(due_date_ts, tz=tz)
+
+    date_str = dt.strftime("%-d %B %Y")
+
+    if dt.hour != 0 or dt.minute != 0:
+        date_str += f" {dt.strftime('%H:%M')}"
+        date_str += f" ({timezone_str})"
+
+    return date_str
+
+
+
+
 def extract_args(text: str) -> list[str]:
     if not text:
         return []
@@ -229,7 +261,6 @@ async def cmd_add(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
     user_id = get_user_id(update)
     room_id = get_room_id(update)
 
-    try:
     bounty = BOUNTY_SERVICE.add_bounty(
         room_id=room_id,
         user_id=user_id,
@@ -237,16 +268,11 @@ async def cmd_add(update: Update, ctx: ContextTypes.DEFAULT_TYPE) -> None:
         link=link,
         due_date_ts=due_date_ts,
     )
-    except PermissionError as e:
-        await update.message.reply_text(f"⛔ {e}")
-        return
-    except ValueError as e:
-        await update.message.reply_text(f"⛔ {e}")
-        return
 
     due_str = ""
     if due_date_ts:
-        due_str = f" | Due: {time.strftime('%Y-%m-%d', time.localtime(due_date_ts))}"
+        timezone_str = BOUNTY_SERVICE.get_timezone(room_id)
+        due_str = f" | Due: {format_due_date(due_date_ts, timezone_str)}"
     await update.message.reply_text(
         f"✅ Bounty added (#{bounty.id}){due_str}",
         disable_web_page_preview=True,