Release HonZuki - v2.16.0 · YTFL/HonZuki-BookTracker

[2.16.0] - 2026-03-28

Achievements platform rollout - Added full achievements feature set with tier/category definitions, unlock detection, unlock toasts, dedicated achievements index/detail pages, and home/profile achievement surfacing.
Locked-achievement progress UI - Added per-achievement progress display on achievement detail pages for not-yet-unlocked achievements.
Achievement state tracking - Added user achievement state support for latest unlock, recent unlock list, and viewed status handling.
Public profile sharing - Added shareable public profile links, profile share action, and dedicated public profile route (/p/[shareId]).
Unified public profile rendering - Added public-view mode using the same profile renderer as signed-in profiles for visual parity.
Profile XP/Level module - Added reusable XP/level utility layer and integrated it into profile header rendering.
Circular level avatar - Added reusable circular progress avatar with level badge for profile identity/progression display.
Historical achievement reconciliation script - Added admin script to backfill historically accurate unlock dates for existing achievement records.

Profile achievements behavior - Changed profile achievements from "recent only" to showing all unlocked achievements.
Profile labeling - Non-own profile titles now display as "'s Profile" for clearer ownership context.
Friends surface status - Friends page now explicitly displays "Coming Soon" while social interactions are staged.
Sidebar IA - Reordered navigation below Stats to Profile → Achievements → Friends.
Share behavior by platform - On Windows, profile share now directly copies link; on other platforms native share is used when available.
Relationship CTA behavior - Non-own profile header now shows disabled "Send Friend Request" state to avoid unfinished-flow actions.
XP economy redesign - Rebalanced XP sources to event-based rewards: book add (+5), book start (+10 once per book), book completion (+20), series completion (+40), every 100 pages (+15), and tier-based achievement XP (basic +60, advanced +120, elite +250).
Level progression redesign - Updated progression curve and raised cap to level 30 with tuned early/mid/late/endgame scaling.
Post-cap progression behavior - XP beyond cap now remains visible as banked XP and is retained for future level-cap increases.

Historical unlock-date accuracy - Fixed legacy achievements with inaccurate unlock chronology by reconciling from historical reading/shelf/series activity.
Public profile data gaps - Fixed public profiles not loading currently reading, avatar, and shelves in some cases.
Public/shared read access - Fixed permission/rule gaps affecting public profile and shared profile data reads.
Public profile parity regressions - Fixed mismatches between private and public profile rendering paths.
Share UX reliability on Windows - Fixed inconsistent share flow by enforcing clipboard-first behavior on Windows.

Added/updated Firestore rules for public_profile_shares schema validation and active-share-gated reads.
Extended rule coverage for public/shared profile rendering, including profile-related subcollections and achievements read paths.

Executed achievement unlock-date reconciliation in dry-run and live modes with expected unlock document updates.
Verified production build success and deployed updated Firestore rules.