feat: integrate in-room chat cloud function with mute support

[Muneerali199]

Description

Closes #730

Integrates the in-room chat backend (Resonate-Backend PR #173) into the Flutter frontend, and adds mute moderation support.

Changes

lib/controllers/room_chat_controller.dart

• sendMessage(): Uses cloud function for server-validated sends (participant check, mute check) with direct DB fallback
• deleteMessage(): Uses cloud function for authorized deletion (creator or admin) with direct DB fallback
• New muteUser(targetUid): Admin-only mute via cloud function
• New unmuteUser(targetUid): Admin-only unmute via cloud function
• New checkMuteStatus(): Checks if current user is muted on chat open
• New isMuted observable for reactive UI
• New isAdmin getter

lib/views/screens/room_chat_screen.dart

• Muted banner at top of chat when user is muted
• Input field disabled with "You are muted" hint when muted
• Send button disabled when muted
• "Mute user" option in long-press context menu (admin only, excludes self)
• Admin check uses existing appwriteRoom.isUserAdmin

lib/utils/constants.dart

• Added chatFunctionId and chatMutesTableId constants

Setup

After deploying the chat cloud function (Resonate-Backend PR #173), set chatFunctionId in constants.dart to the deployed function ID.

Related

• Backend PR: feat: add in-room text chat cloud function with moderation support Resonate-Backend#173

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