Feat/threads author pages

[HarshMN2345]

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[greptile-apps]

Greptile Summary

This PR introduces author profile pages at /threads/authors/[id], linking Discord message authors to a dedicated page showing their bio, stats, and threads. It also enriches thread cards and detail pages with resolved badges, participant counts, and last-activity timestamps.

• New author route (+page.server.ts / +page.svelte): loads author and their threads separately with graceful fallback, renders a profile with full meta/OG/JSON-LD tags, and shows "Showing X of Y" when the 25-thread fetch limit is hit.
• Thread UI enhancements: resolved badge, participant-count tag, timeAgo relative timestamps on cards, and reaction counts on messages — author names in MessageCard now link to the author page.
• Icon/sprite additions: persons SVG added in source and optimised forms; registered as zzz-persons in the sprite and IconType, though the thread detail page still uses an inline SVG for the participant badge.

Confidence Score: 5/5

Safe to merge; all changes are additive new pages and incremental UI enhancements with no destructive side-effects.

The new author page is well-structured with proper error boundaries, meta tags, and graceful thread-fetch fallback. Remaining issues are style-level — the zzz- prefix in the public icon API, a duplicated isResolved regex, and an inline SVG bypassing the icon component added in the same PR — none affect correctness or runtime behaviour.

helpers.ts still hardcodes the authors collection ID (flagged in previous reviews); types.ts exposes the zzz-persons name as a public API entry.

Important Files Changed

Filename	Overview
src/routes/threads/authors/[id]/+page.server.ts	New SvelteKit load function; separates getAuthor and getAuthorThreads into independent try-catch blocks so a thread-fetch failure degrades gracefully.
src/routes/threads/authors/[id]/+page.svelte	New author profile page with avatar, bio, role badges, stats, and thread list; includes all required meta/OG tags and JSON-LD structured data.
src/routes/threads/helpers.ts	Adds getAuthor (hardcoded 'authors' collection ID — previously flagged) and getAuthorThreads (uses env-var collection ID correctly).
src/routes/threads/ThreadCard.svelte	Adds resolved badge, time-ago display, and participant count; isResolved regex is duplicated from the thread detail page.
src/routes/threads/[id]/+page.svelte	Adds resolved badge and participant-count tag using raw inline SVG instead of the zzz-persons icon added in this same PR; isResolved regex duplicated from ThreadCard.
src/lib/components/ui/icon/types.ts	Adds 'zzz-persons' to IconType — the zzz- prefix is a sort-order hack that leaks into the public API.
src/routes/threads/[id]/MessageCard.svelte	Author name conditionally linked to /threads/authors/[id] when author_id is present; adds reaction count display.
src/routes/threads/types.ts	Adds DiscordAuthor interface and extends DiscordThread/DiscordMessage with optional fields.
src/lib/utils/metadata.ts	Adds createAuthorPageSchema generating schema.org ProfilePage + Person JSON-LD with interaction statistics.
src/routes/docs/references/[version]/[platform]/[service]/+page.svelte	Adds formatGroup helper to split camelCase API group names for sidebar display; small isolated change.

_{Reviews (9): Last reviewed commit: "Fix implicit any type on threads array" | Re-trigger Greptile}