Add ELRS Link Sentinel (link-quality widget) to scripts.json

[Mariator-pro]

Adds ELRS Link Sentinel to scripts.json under "Telemetry & Widgets".

ELRS Link Sentinel watches the ExpressLRS link in the background and gives
graded audible warnings before the connection breaks down. It reads per-antenna
RSSI, link quality and the current RF mode, then warns near the mode's
sensitivity limit (Link Warning) and once packets start dropping (Link Critical).
Ships in two interchangeable variants; install exactly one:

• Function script (audio only) - runs on all EdgeTX radios
• Color widget - same audio warnings plus a live link display

Requirements: EdgeTX >= 2.11, ExpressLRS >= 4.0
Repo: https://github.com/Mariator-pro/elrs-link-sentinel

Screenshot added under ASSETS/elrs-link-sentinel/.

Summary by CodeRabbit

• New Features
  • Added a new catalog entry, ELRS Link Sentinel, under Telemetry & Widgets.
  • Included a description, reference link, screenshot, and tags for easier discovery and identification.
  • Added support indicators for color and black-and-white display modes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 61698663-6e98-4c9c-b7e3-96f2be830b31

📥 Commits

Reviewing files that changed from the base of the PR and between c57e782 and d9d2457.

⛔ Files ignored due to path filters (1)

• ASSETS/elrs-link-sentinel/screenshot-1.png is excluded by !**/*.png

📒 Files selected for processing (1)

• scripts.json

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📝 Walkthrough

Walkthrough

Adds a new catalog entry, "ELRS Link Sentinel", to scripts.json under the "Telemetry & Widgets" category, including description, infourl, images, and tags fields.

Changes

Script Catalog Update

Layer / File(s)	Summary
Add ELRS Link Sentinel entry scripts.json	New JSON object added after the "RCIC" entry defining category, description, infourl, images, and tags for the ELRS Link Sentinel widget.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• EdgeTX/lua-scripts#51: Introduces the per-entry category/images/tags schema in scripts.json that this PR's new entry follows.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding ELRS Link Sentinel to scripts.json.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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