docs(surveys): correct EmojiRating unselected tint in KDoc

[phillram]

💡 Motivation and Context

The EmojiRating KDoc says unselected emojis use ratingButtonColor. The code tints them with inputTextColor at 50% alpha:

val tint =
    if (isSelected) {
        appearance.ratingButtonActiveColor
    } else {
        appearance.inputTextColor.copy(alpha = 0.5f)
    }

The code is right and matches the iOS SDK, so this corrects the doc to describe what it does. ratingButtonColor is not read in this file at all, which makes the old wording actively misleading for anyone reasoning about survey appearance across platforms.

Spotted by an SDK user while they were investigating a related iOS rendering bug (posthog-ios#793).

• From https://us.posthog.com/project/2/support/tickets/70521

💚 How did you test it?

Not built — comment-only change, no behavior touched. I checked that both KDoc links resolve: ResolvedSurveyAppearance declares inputTextColor and ratingButtonActiveColor.

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

If releasing new changes

• Ran pnpm changeset to generate a changeset file

No changeset — nothing user-facing changes, so there is nothing to put in release notes.

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Written with Claude Opus in PostHog Desktop. This came out of investigating an iOS emoji rating bug, where the Android implementation was the reference for correct behavior. Reading it turned up the doc mismatch. Verified against the source rather than the report: read the tint branch and the ResolvedSurveyAppearance fields before editing.

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Created with PostHog Desktop

[github-actions]

⚠️ `posthog-android-surveys-compose` is modified but this PR has no changeset

This is informational — the PR is not blocked. Click the triangle above to collapse, or push a fix and this comment will auto-delete.

Modified in this PR but no changeset added:

• posthog-android-surveys-compose

If this change should ship, run pnpm changeset and select a bump level.
If it isn't user-facing (refactor with no behavior change, internal tooling, generated files), no action needed.

[greptile-apps]

_{Reviews (1): Last reviewed commit: "docs(surveys): note thumbs scale in Emoj..." | Re-trigger Greptile}