P1: DeckContext + deckStorage + draft→cloud migration

[Doberjohn]

Working-deck state with local drafts + cloud sync.

Scope

• DeckContext/useDeck (mounted under CardDataProvider): addCard/removeCard/setQuantity/markCore/setGameplan/renameDeck/clearDeck.
• deckStorage.ts — localStorage draft persistence built exactly like features/voting/lib/voteStorage.ts (inkweave:deck:* keys, safe read/write, schemaVersion).
• Debounced Supabase sync when authed (last-write-wins by updatedAt).
• First-sign-in draft → cloud migration (idempotent, guarded by inkweave:deck:migrated:<uid>).

Tests: deckStorage namespacing + corruption-clear; migration idempotency.

Part of #451 · Deck Builder & Engine Score milestone.

[Doberjohn]

Local half shipped in 63b6ddd (epic branch claude/inkweave-deck-builder-af3e5b, unpushed).

Delivered:

• apps/web/src/features/deck/state/deckStorage.ts — draft persistence cloned from voteStorage.ts (inkweave:deck:draft key, safe read/write, schemaVersion guard, self-clears on corruption) + the auth-independent migration guard hasMigratedDraft/markDraftMigrated.
• apps/web/src/features/deck/state/DeckContext.tsx — DeckProvider/useDeck with all 7 ops, derived inks (engine getInks), debounced localStorage persistence.
• Barrel state/index.ts. 14 unit tests (6 storage + 8 context). tsc -b, eslint, check:stories, pre-commit suite all green.

Design note: the state layer is permissive — it does not enforce the Core hard rules. calculateDeckStats remains the single legality source; #468's DeckPanel enforces in the UI.

Still open on this issue (deferred to post-auth):

• Debounced Supabase sync when authed — needs P1: profiles + decks migrations + RLS + deckRepository #464 decks repo.
• First-sign-in draft-to-cloud copy — needs P1: Supabase Auth wiring (Google + Discord) #463 auth + P1: profiles + decks migrations + RLS + deckRepository #464 repo (guard helpers already in place).
• Mount DeckProvider into the tree — handled by P1: routes + zero-prop pages + mobile Decks tab #466 (route-scoped).

[Doberjohn]

Post-implementation review fix (11e141d) — two latent bugs in the #465 state layer (both invisible until #466 mounts DeckProvider) are now fixed on the epic branch:

1. the debounced persist lost the last edit on unmount/pagehide -> added an unmount + pagehide flush;
2. derived inks did not reconcile against the async card DB -> inks are now derived in render (gated on isLoading), self-healing on DB load and after a set-graduation id-renumber.

+4 lifecycle tests (restore-on-mount, unmount-flush, self-heal, no-wipe-during-load); state suite 18 pass, tsc -b + eslint clean. Note for #466: when wiring the live getPairScore into suggestions, gate the BECKON/Shift/Singer boosts on pairScore === 0 (double-count guard).

[Doberjohn]

Delivered and merged into the deck-builder integration branch via #480 (not yet in production / master). Closing as complete; it rides to production when deck-builder later merges to master.