feat: React Native SDK update for version 1.2.0-rc.1

[ArnabChatterjee20k]

This PR contains updates to the SDK for version 1.2.0-rc.1 (release candidate).

What's Changed

• Added: background push notifications render the server notification title, body, and image
• Added: Android shows notification images (BigPictureStyle) and long bodies (BigTextStyle)
• Added: the SDK requests Android 13+ POST_NOTIFICATIONS itself on first background subscribe
• Added: notification data now carries topic and payload
• Fixed: a server-sent title dedupes to one notification per topic instead of one per subscription

[hansi-codes]

🟢 Tier S · Ready to merge

Updates the SDK to 1.2.0-rc.1 and renders server-provided notification content, including Android images and expanded text. Adds automatic Android notification-permission requests, notification payload metadata in the Expo path, and title-based notification deduplication.

Verdict	New comments	Fixed	Still open
✅ Approved	0	0	0

📂 Walkthrough · 7

File	Change
CHANGELOG.md	Documents the new notification behavior for 1.2.0-rc.1.
README.md	Describes automatic Android permission requests and server notification content.
android/src/main/java/io/appwrite/services/PushBackground.kt	Parses notification content, deduplicates server titles, and downloads images for expanded notifications.
package.json, package-lock.json	Updates the package version to 1.2.0-rc.1.
src/client.ts	Updates the SDK version header.
src/react-native-shim.d.ts	Adds permission API types and notification metadata support.
src/services/push.ts	Requests Android notification permission and uses server content with deduplicated local notifications.

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_{Reviewed 9687d20 · Details · Comment @hansi-codes review to re-run, or mention @hansi-codes with a question.}

[hansi-codes]

🔵 Tier A · Looks good to merge. Summary