Extract backup import logic into reusable hook

[kongyo2]

Summary

Refactored the backup import functionality into a reusable custom hook (useImportBackup) to eliminate code duplication across the notebook editor and cover screens. Also introduced a shared Placement type to reduce duplication in model types.

Key Changes

• New hook: Created src/state/backup.ts with useImportBackup() hook that encapsulates the entire backup import flow (file selection, validation, confirmation dialog, and state update)
• Removed duplication: Eliminated nearly identical onImport implementations from both src/app/notebook/[id].tsx and src/app/index.tsx
• Type refactoring: Introduced Placement interface in src/lib/types.ts as a base type for Sticker, Shape, and Photo to consolidate common positioning properties (id, x, y, rot)
• Updated normalization: Refactored normalizeSticker(), normalizeShape(), and normalizePhoto() in src/lib/model.ts to use the new normalizePlacement() helper function

Implementation Details

• The useImportBackup() hook accepts an optional onImported callback that fires after successful import, allowing the notebook editor to navigate back to the cover screen
• The hook returns an async function that can be directly assigned to UI handlers
• Type inheritance (extends Placement) eliminates ~12 lines of duplicated property definitions across three types

https://claude.ai/code/session_01TmeSNpFwu9PqSPbejMYqBX

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: QUIET

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Run ID: 38d31e50-4043-4f6b-9f0d-72150ba9eaf8

📥 Commits

Reviewing files that changed from the base of the PR and between fefc1a8 and 5ef6f19.

📒 Files selected for processing (5)

• src/app/index.tsx
• src/app/notebook/[id].tsx
• src/lib/model.ts
• src/lib/types.ts
• src/state/backup.ts

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