fix: load Safari shared URLs as typed objects

[ngocdevv]

Summary

• load Safari URL items through typed NSItemProvider object loading
• preserve URL scheme and text size validation
• add regression coverage for URL and plain-text provider loading
• release as expo-share-content@0.1.1

Verification

• npm test — 40/40 passed
• npm run lint — passed
• npm run build:all — passed
• npm run verify:cjs — passed
• iOS Safari Share Extension XCUITest — passed
• Android 16 emulator cold text + warm URL receive-share QA — passed
• npm tarball audit — passed