SimTradeDesk v0.7.6

Changed

• Simplify market data updates to one automatic action that prefers incremental packages and falls back to a full baseline only when necessary.
• Show unified download and merge progress while market data updates run in the background.

Fixed

• Apply incremental update chains to a snapshot before publishing, preserving the existing usable dataset when a download or merge fails.
• Clean temporary download and snapshot files after successful, failed, or cancelled market data updates.