docs: clarify thumbnail actions are desktop-only

[D3SOX]

The mobile video menu replaces the configurable thumbnail shortcut with an action to open a video in a background tab, so the extra-thumbnail-action setting is now desktop-only.

Companion application PR: OpenTubeX/OpenTubeX#1753. Merge this documentation correction alongside that app change.

Clarify that scope in the existing “Configurable thumbnail action” section. The rest of the guide and its screenshots remain unchanged.

Validation: both feature-section tests pass; the change is one sentence.

Changes made by GPT-6.1-Sol through the Codex harness in T3 Code.

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📝 Walkthrough

Walkthrough

The configurable extra thumbnail action description now specifies that the action button applies on desktop.

Changes

Thumbnail action documentation

Layer / File(s)	Summary
Clarify desktop availability src/content/extra-features.md	The description of the configurable extra thumbnail action button now states that it applies on desktop.

Priority: ⬇️ Low

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

Change: Other

Merge Risk: 🔵 Low · up to 2a8ca

Mobile users may miss the video-menu action or assume the setting does not apply there. Clarify the mobile placement; the impact is limited to feature discoverability.

Architecture Summary

Architecture risk: 🔵 Low · up to 2a8ca

The change affects 1 system.

Changed systems: src

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — src (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in src/content/extra-features.md: Clarifies that the configurable extra thumbnail action button is available on desktop.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.
Title check	✅ Passed	The title clearly and concisely describes the documentation change: clarifying that thumbnail actions are desktop-only.
Description check	✅ Passed	The description directly explains the desktop-only scope, the mobile behavior, the documentation change, and validation results.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @src/content/extra-features.md:
- Line 503: Update the description near “On desktop, choose an extra action
button” to state that the same selected action appears in the video menu on
mobile.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: ef41d373-dd3e-4c59-9e9b-4d1b26fccb90

📥 Commits

Reviewing files that changed from the base of the PR and between 8190149 and 2a8ca35.

📒 Files selected for processing (1)

• src/content/extra-features.md

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