docs: clarify live and premiere rewind support

[D3SOX]

The current guidance says built-in playback can rewind livestreams and premieres. The application now uses HLS at the live edge and disables built-in live seeking.

Update the provider table, playback guide, and rewind feature entry to explain that rewind requires yt-dlp and an available DVR window; streams with DVR disabled cannot be rewound.

Application change: OpenTubeX/OpenTubeX#1764.

Validation: all 41 website tests pass; documentation links and Markdown changes checked.

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

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 3ecac192-9b26-44e6-8785-d7acc6d714d5

📥 Commits

Reviewing files that changed from the base of the PR and between 75a01b5 and 7d610d6.

📒 Files selected for processing (3)

• src/content/extra-features.md
• src/content/guides/playback.md
• src/content/guides/providers.md

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📝 Walkthrough

Walkthrough

The documentation now states that Built-in plays live streams and premieres at the live edge without seeking. Rewinding requires yt-dlp and a rewindable stream from YouTube.

Changes

Live-stream seeking documentation

Layer / File(s)	Summary
Document live-stream seeking behavior src/content/extra-features.md, src/content/guides/playback.md, src/content/guides/providers.md	The pages specify that Built-in does not seek in live streams or premieres. They state that yt-dlp can seek when YouTube provides a rewindable stream, which may cover less than the full broadcast. The extra-features page also states that DVR-disabled streams cannot be rewound.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~4 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 7d610

The pages consistently explain when live-stream rewind is available. No supported discrepancy currently blocks merging.

Architecture Summary

Architecture risk: 🔵 Low · up to 7d610

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; 3 changed files map to changed impact.

Before / after behavior

• observed — Modified behavior in src/content/extra-features.md: The description no longer presents rewind as experimental or generally available. It specifies that yt-dlp is required, rewind depends on YouTube providing a rewindable stream, and DVR-disabled streams cannot be rewound; the built-in method plays live streams and premieres at the live edge without seeking.
• observed — Modified behavior in src/content/guides/playback.md: The guide replaces the general warning that live streams may not support seeking through the full video with a specific distinction: built-in playback does not support seeking in live streams or premieres, while yt-dlp can enable seeking when YouTube provides a rewindable stream, potentially for less than the full broadcast.
• observed — Modified behavior in src/content/guides/providers.md: The Built-in description now specifies live-edge playback without seeking, replacing the previous claim that seeking works when YouTube provides a rewindable stream. The yt-dlp description now specifies seeking in live streams and premieres when YouTube provides a rewindable stream; its availability requirement and longer-startup caveat are unchanged.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main documentation change: clarifying live-stream and premiere rewind support.
Description check	✅ Passed	The description directly explains the documentation updates, the yt-dlp and DVR requirements, the related application change, and validation results.
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.

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