Users don't use the Reward Shop, so removing it along with the associated points system to reduce complexity. Existing user data auto-migrates on first load.

Storage (src/storage.ts)

• Bumped DATA_SCHEMA_VERSION to 2; initializeStorage() now auto-runs migrateToLatest() when stored schema is older — tasks, habits, projects, finances etc. are preserved; rewards, purchaseHistory, totalPoints, and pointsBreakdown are dropped
• Removed Reward, Purchase, PurchaseResult, PointsBreakdown interfaces and points field from Task/Habit
• Added LegacyUserStats interface to safely cast old userStats during migration instead of as any
• Removed addReward, updateReward, deleteReward, getRewards, purchaseReward, getPurchaseHistory, addPoints methods

App logic (src/app.ts)

• Removed renderShop, reward modal methods, purchaseReward, currentEditingRewardId
• Removed addPoints() calls from task/habit completion; removed points from task/habit form read/write and card rendering

UI (index.html)

• Removed Points header stat (Level and Streak remain), 🛒 Shop nav tab, Shop tab section, Reward modal, and Points Value fields from task/habit forms

Tests (tests/storage.test.ts)

• Removed rewards shop and points and leveling suites; replaced with leveling and streak keeping level/streak coverage

• Fixes Remove Reward Shop and Points Features #55

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