[davidjhonsonmate]

Closes #490
Closes #491
Closes #492
Closes #493

Summary

• use-local-storage.ts: handle null newValue (removal events) by resetting to initialValue (useLocalStorage cross-tab sync ignores removal events (newValue is null) #493)
• avatar-upload.tsx: revoke object URL on cancel, new selection, and unmount (AvatarUpload creates object URL but never revokes it on cancel #492)
• connect/page.tsx: replace dynamic imports with static imports (Connect page dynamically imports modules on every connection attempt #491)
• transactions.ts: rename xdr parameter to txXdr to avoid shadowing imported xdr module (transactions.ts signAndSubmitTransaction parameter xdr shadows imported xdr module #490)

localStorage Fix (Issue #493)

• When another tab removes the localStorage item, the hook now resets to initialValue
• Cross-tab sync works correctly for both updates and removals

AvatarUpload Fix (Issue #492)

• URL.revokeObjectURL called when crop dialog closes
• URL.revokeObjectURL called when a new image replaces the old one
• URL.revokeObjectURL called on component unmount
• Uses ref to track current object URL

Connect Page Fix (Issue #491)

• Static imports for getProfile and useAuthStore
• No more dynamic import() overhead on connection attempts

Transactions Fix (Issue #490)

• Renamed xdr parameter to txXdr to avoid shadowing imported xdr module
• Prevents future bugs from parameter shadowing

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