Add Telegram channel footer link

[mdm108]

Motivation

• Provide an easy, one-click way for users to open and join the project's Telegram channel from the footer support section.
• Allow the channel URL to be configurable via environment so it can be changed without code updates using NEXT_PUBLIC_TELEGRAM_CHANNEL_URL with a sensible default.

Description

• Added a TELEGRAM_CHANNEL_URL constant in components/page-footer/Support.tsx that reads NEXT_PUBLIC_TELEGRAM_CHANNEL_URL and falls back to https://t.me/github.
• Imported PaperAirplaneIcon and added a new support link (id="join-telegram-channel") that opens the Telegram URL in a new tab with target="_blank" and rel="noopener noreferrer" in components/page-footer/Support.tsx.
• Added the UI translation key join_telegram_channel under the support section in data/ui.yml.
• Applied Prettier formatting to the modified files.

Testing

• Ran npx prettier --check components/page-footer/Support.tsx data/ui.yml, which passed after formatting.
• Ran npx tsc --noEmit, which passed with no type errors.
• Commit hook executed lint-staged (ESLint + Prettier) during the commit, and the hooked tasks succeeded.

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Codex Task

[cloudflare-workers-and-pages]

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