Use code blocks for /sendbatch help examples to enable single-copy UX

[Copilot]

Each line of the /sendbatch usage and examples was individually backtick-wrapped, forcing users to copy the command line-by-line in Telegram instead of all at once.

Changes

• internal/telegram/sendbatch.go — Replaced per-line `backticks` with triple-backtick code blocks in the error help message (Usage, Example 1, Example 2 sections)
• translations/en.toml — Same treatment for the /sendbatch entry in the main help command text

Before:

helpMsg += "*Usage:*\n`/sendbatch [shared memo]`\n`<amount> @user [memo]`\n`<amount> @user [memo]`\n\n"

After:

helpMsg += "*Usage:*\n```\n/sendbatch [shared memo]\n<amount> @user [memo]\n<amount> @user [memo]\n```\n\n"

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