TF-4449 [Part 2] Add drive_attachment presentation layer and composer integration

[tddang-linagora]

Issue

• TF-4449 ADR External drive attachments #4569
• Open Drive file picker when tapping the attachment button in the mail composer #4584

Description

Add presentation layer to drive_attachment package:

• Notifiers: DriveAttachmentNotifier, DriveAccessTokenNotifier, WorkplaceFqdnNotifier
• Providers: DriveAttachmentProviders
• Views: DriveIntentWebViewModal (mobile, web, shell variants)
• Widgets: DriveAttachmentChip, DriveAttachmentListWidget, DriveAttachmentPickerButton
• Mixins: DriveIntentMessageHandlerMixin, DriveIntentShims

Integrate into main app:

• Composer: attach drive files via picker button (mobile app bar, web bottom bar)
• Service layer: ExternalAttachmentService, DriveExternalAttachmentAdapter
• Network: inject drive access token in authorization interceptor
• Bindings: register drive attachment providers in NetworkBindings
• Bump jmap_dart_client to feature/linked-file-header

Resolved

Web

web.mov

Mobile

mobile.webm

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[github-actions]

This PR has been deployed to https://linagora.github.io/tmail-flutter/4588.

[codescene-delta-analysis]

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Gates Passed
3 Quality Gates Passed

Absence of Expected Change Pattern

• tmail-flutter/lib/features/composer/presentation/widgets/mobile/app_bar_composer_widget.dart is usually changed with: tmail-flutter/lib/features/composer/presentation/widgets/mobile/landscape_app_bar_composer_widget.dart

Quality Gate Profile: The Bare Minimum
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