fix(fcm): skip session update without token

[SeniorZhai]

No description provided.

[Copilot]

Pull request overview

This PR improves Firebase Cloud Messaging (FCM) token handling during session updates by preventing session updates when a usable token can’t be obtained, and adds a debug UI action to manually trigger an FCM token/session update.

Changes:

• Update SessionWorker to use await() for FCM token retrieval, gate behavior on Google Play services availability, and avoid proceeding with missing/blank tokens.
• Add a “Update FCM Token” action to the Log & Debug screen that triggers a session update using the current FCM token and surfaces success/failure to the user.
• Add kotlinx-coroutines-play-services dependency and related localized strings.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
app/src/main/res/values/strings.xml	Adds new strings for the debug “Update FCM Token” action and success toast.
app/src/main/res/values-zh-rTW/strings.xml	Adds Traditional Chinese (Taiwan) translations for the new debug strings.
app/src/main/res/values-zh-rCN/strings.xml	Adds Simplified Chinese translations for the new debug strings.
app/src/main/res/layout/fragment_log_debug.xml	Adds a new row/button in the Log & Debug screen for updating the FCM token.
app/src/main/java/one/mixin/android/worker/SessionWorker.kt	Changes session update flow to retrieve FCM token via coroutines and skip/retry behavior around token availability.
app/src/main/java/one/mixin/android/ui/setting/LogAndDebugViewModel.kt	Adds a debug-only API to fetch the FCM token and call updateSession.
app/src/main/java/one/mixin/android/ui/setting/LogAndDebugFragment.kt	Wires the new UI action to call the ViewModel and show progress + result dialogs/toasts.
app/build.gradle.kts	Adds kotlinx-coroutines-play-services to support Task.await().

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