fix(sessions): implement per-message sessions with captions and cancel#39
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…closes #30 Replace single-URL-per-user state (ProcessVideoDC) with per-link MediaSession keyed by status message ID. Each link now gets its own session with independent URL, caption, and cancellation token, so pressing a button always processes the correct link regardless of how many were sent. Changes: - Add MediaSession and MediaSessionManager (ConcurrentDictionary-based) - Encode session ID in keyboard callback data (send_to_all_contacts:{id}, etc.) - Add parameterized callback handlers for all distribution actions + cancel - Route media session callbacks through factory before UserSession check - Add Cancel button to distribution keyboard - Handle expired sessions with user-friendly alert - Add resource strings for Cancel, SessionExpired, Cancelled (EN + RU)
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Summary
Fixes the critical bug where pressing a button on one link processed a different link.
MediaSessionkeyed by status message IDCloses #30
Architecture
New files
TelegramBot/Sessions/MediaSession.cs— session modelTelegramBot/Sessions/MediaSessionManager.cs— ConcurrentDictionary manager with TTLTelegramBot/Handlers/ICallBackQuery/IMediaSessionCallbackQuery.cs— 6 session-aware handlersTest plan
dotnet buildpasses