# MTG Python Deckbuilder v2.5.2

## Summary
- Builder responsiveness upgrades: smarter HTMX caching, shared debounce helpers, and virtualization hints keep long card lists responsive.
- Commander catalog now ships skeleton placeholders, lazy commander art loading, and cached default results for faster repeat visits.
- Deck summary streams via an HTMX fragment while virtualization powers summary lists without loading every row up front.
- Mana analytics load on demand with collapsible sections and interactive chart tooltips that support click-to-pin comparisons.

## Added
- Skeleton placeholders accept `data-skeleton-label` microcopy and only surface after ~400 ms across the build wizard, stage navigator, and alternatives panel.
- Must-have toggle API (`/build/must-haves/toggle`), telemetry ingestion route (`/telemetry/events`), and structured logging helpers capture include/exclude beacons.
- Commander catalog results wrap in a deferred skeleton list while commander art lazy-loads via a new `IntersectionObserver` helper in `code/web/static/app.js`.
- Collapsible accordions for Mana Overview and Test Hand sections defer heavy analytics until they are expanded.
- Click-to-pin chart tooltips keep comparisons anchored and add copy-friendly working buttons.
- Virtualized card lists automatically render only visible items once 12+ cards are present.

## Changed
- Commander search and theme picker now share an intelligent debounce to prevent redundant requests while typing.
- Card grids adopt modern containment rules to minimize layout recalculations on large decks.
- Include/exclude buttons respond immediately with optimistic updates, reconciling gracefully if the server disagrees.
- Frequently accessed views, like the commander catalog default, now pull from an in-memory cache for sub-200 ms reloads.
- Deck review loads in focused chunks, keeping the initial page lean while analytics stream progressively.
- Chart hover zones expand to full column width for easier interaction.

## Fixed
- _None_