Fix Telegram portrait video distortion by probing video dimensions through the shared media helper and passing width/height to sendVideo.
Validation:
- Targeted Telegram/media tests passed locally.
- Plugin SDK API baseline check passed locally.
- Formatter and git diff whitespace checks passed locally.
CI note: current boundary drift observed on prior run came from existing src/plugin-sdk/discord.ts and src/plugin-sdk/telegram-account.ts, not this PR diff.