docs(chrome-extension): hide Celebration setting behind an easter-egg disclosure

[samgutentag]

Summary

• Wraps the Celebration extension setting (the opt-in confetti burst) in a closed <details> block
• Summary text reads "Have you turned on Celebration Mode?" so the disclosure functions as a discovery prompt rather than a labeled section
• Drops the explicit ### Extension settings heading since the section was a single easter-egg setting

Context

Follow-up to #626 (Celebration setting docs). Treating it as a hidden discovery on the extension page makes the reveal more fun for readers who poke around, rather than calling it out under a regular heading.

Test plan

• Verify the <details> renders as a closed disclosure in GitBook preview, with "Have you turned on Celebration Mode?" as the bold summary
• Click to expand and confirm the access instructions, settings table, and reduced-motion note all render correctly inside
• Confirm the next section (### Frequently asked questions) still flows correctly after the disclosure

[trunk-staging-io]

😎 Merged successfully - details.

[claude]

Claude finished @samgutentag's task in 1m 13s —— View job

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Review

• Read PR diff and changed file
• Compared against repo style conventions and sibling pages
• Checked typos, grammar, and formatting
• Posted review

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Summary: Small, focused change. Removes the ### Extension settings H3 and wraps the Celebration block in a closed <details> so it functions as a hidden discovery prompt. Implementation is clean and matches the intent from the PR body.

No blocking issues. A few non-blocking notes below.

Typos / grammar / formatting

Nothing flagged — the moved content is identical, and the new summary line reads correctly.

Style & consistency

• ✅ The <details><summary><strong>…</strong></summary> pattern matches the FAQ disclosures further down (merge-queue/chrome-extension.md:79–109). Using a plain <details> (no open) instead of <details open> is correct here — closed-by-default is what makes it an easter-egg rather than another expanded card.
• ✅ Removing the ### Extension settings heading removes the entry from the GitBook right-hand TOC, which is consistent with the easter-egg intent.

Non-blocking observations

1. Visual placement under "Authentication and security." With the H3 gone, the disclosure now sits as a bare block immediately after the security bullets and before ### Frequently asked questions. In rendered output, a reader scanning the page may briefly read the closed disclosure as part of the security section. If you want to make the boundary a bit more obvious without restoring the heading, a horizontal rule (---) above the <details> would visually break the security section from the easter-egg without adding it back to the TOC. Optional — current placement is fine if the disclosure's bold summary is enough of a separator in GitBook's rendering.

2. Setting name vs. summary phrasing. The setting in the table is called Celebration (single word), while the summary asks about "Celebration Mode." That's a small naming mismatch — readers who toggle it on will see a checkbox labeled "Celebration," not "Celebration Mode." Minor, and the playful summary phrasing arguably reads better than "Have you turned on Celebration?", so this is a judgment call. Worth a quick look in GitBook preview to make sure it doesn't feel jarring.

3. Test plan item 1 notes "bold summary" — confirmed: <strong> is used inside <summary>, matching the FAQ disclosures.
   · Branch

[github-actions]

Auto-approved: Claude code review passed.

[claude]

Claude finished @samgutentag's task in 1m 27s —— View job

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Review

• Read PR diff and changed file
• Check typos, grammar, and formatting
• Compare against repo style conventions
• Post review feedback

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Summary: Two-commit PR. The first commit wrapped Celebration in a closed <details> block under a "Have you turned on Celebration Mode?" summary. The second commit (347507c) moved the disclosure into the Frequently asked questions section as a closed-by-default entry titled "How do I enable Celebration Mode?". The current state is a clean, focused change — the standalone ### Extension settings H3 is gone and the easter egg lives at the bottom of the FAQ.

No blocking issues. A few non-blocking notes below.

Typos / grammar / formatting

Nothing flagged. The moved content is byte-identical to what was in the previous "Extension settings" section, and the new FAQ summary line reads correctly.

Style & consistency

• ✅ The four pre-existing FAQ entries use <details open> (lines 65, 73, 81, 89). The new Celebration entry intentionally uses plain <details> (line 97) — closed-by-default is what makes it an easter egg, so the divergence is correct.
• ✅ <summary><strong>…</strong></summary> matches the surrounding FAQ pattern.
• ✅ Removing ### Extension settings removes the entry from the GitBook right-hand TOC, consistent with the easter-egg intent.
• ✅ Placement at the end of the FAQ section is good — the question is colocated with similarly-phrased "How do I…?" / "Why don't I…?" entries, so it doesn't look out of place when collapsed.

Non-blocking observations

1. PR description is now stale. The body still describes the first-commit state ("Summary text reads 'Have you turned on Celebration Mode?'"). The second commit renamed the summary to "How do I enable Celebration Mode?" and relocated the block into the FAQ. Worth updating the PR description before merge so reviewers and the merge commit message reflect the final shape — though this is purely cosmetic.

2. Celebration vs Celebration Mode naming mismatch persists. Flagged on the previous review and still present: the summary says "Celebration Mode" while the settings table label is just "Celebration." A reader who clicks through to the extension's Options page will see a checkbox labeled "Celebration," not "Celebration Mode." Two ways to resolve, both fine:

   • Rephrase the summary to "How do I enable the Celebration setting?" (matches the table exactly), or
   • Leave as-is — "Celebration Mode" reads more naturally as a phrase, and the table column makes the actual setting label unambiguous once expanded.

   Judgment call; not blocking.

3. Closed-by-default discoverability. Worth eyeballing in GitBook preview that the closed disclosure visually reads as a peer of the four expanded ones (rather than as an inert footer). The test plan covers this.

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[github-actions]

Auto-approved: Claude code review passed.