fix(stage-ui): apply display model on character card activation

[0xSelenicDove]

Summary

• apply active character-card settings from the stable activeCardId activation key
• ensure the selected VRM/Live2D display model reaches the stage runtime when switching cards
• add regression coverage for Issue Fix character card activation not applying its display model #2089

Fixes #2089

Validation

• pnpm typecheck
• pnpm lint (0 errors; existing warnings remain)
• pnpm -F @proj-airi/stage-ui typecheck
• pnpm exec eslint packages/stage-ui/src/stores/modules/airi-card.ts packages/stage-ui/src/stores/modules/airi-card.test.ts
• focused Vitest: 4 tests passed; Node reports the existing localforage storage warning in this environment

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[chatgpt-codex-connector]

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[0xSelenicDove]

Addressed the review feedback in commit 2491acc7f. The synchronization now watches both activeCardId and the active card object, so switching cards and saving edits to the currently active card both update the runtime model/provider settings. Added regression coverage for active-card edits; the review thread is resolved.

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Reviewed commit: 2491acc7f9

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[0xSelenicDove]

Addressed the reset-ordering feedback in commit 2fc177d60. Card data is now cleared before activeCardId, preventing the synchronous watcher from reapplying the old default card model during a full settings reset. Added a regression test. Also mocked the browser-only localforage boundary in the Node unit test; the focused suite now passes 6/6 without unhandled errors.

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Reviewed commit: 2fc177d60c

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[chatgpt-codex-connector]

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Reviewed commit: 47a55e77b6

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[0xSelenicDove]

Rebuilt this PR from origin/main to keep it scoped to character-card/model synchronization. The inherited chat-import commit and all chat-related files have been removed from this PR. It now contains only airi-card.ts and airi-card.test.ts; the chat-import work remains separate.