[Label] Add Label as option to context menu of each email in list

[dab246]

Issue

Resolved

Screen.Recording.2026-02-05.at.13.13.22.mov

Summary by CodeRabbit

• Refactor

  • Reorganized email label management from single email controller to mailbox dashboard controller for centralized handling.
  • Created new mixins to encapsulate label actions, submenu rendering, and context menu behavior.
  • Consolidated label dialog and context menu logic with new synchronization methods for in-memory label updates.
  • Updated action handling signatures to remove BuildContext parameters where applicable.

• Tests

  • Updated test setup to reflect removed label interactor dependencies from single email controller.

[coderabbitai]

Walkthrough

This PR refactors label-handling across email and mailbox-dashboard features. It introduces a new UI action class SyncUpdateLabelForEmailOnMemory for in-memory updates. Label interactors are migrated from email to mailbox-dashboard feature via EmailActionInteractorBindings. SingleEmailController no longer directly handles label interactors, delegating to MailboxDashBoardController instead. Two new mixins—AddLabelToEmailMixin and LabelSubMenuMixin—encapsulate label operations. A new EmailMoreActionContextMenu mixin handles email action context menus. Label-related logic consolidates into mailbox-dashboard extensions. UI flows are updated to use the centralized approach. EmailActionType.labelAs enum category changes from 1 to 2.

Possibly related PRs

• TF-4195 Add a label to an email #4204: Directly intersects with additions of label interactors, UI/mixins, and repository methods that are refactored by this PR
• TF-4236 Remove a label from an email #4239: Modifies label handling in email feature and introduces coordinated in-memory label update flows matching this refactoring
• TF-4179 Display tag list in sidebar #4181: Modifies label-related features in mailbox-dashboard controller and label UI handling alongside this PR's changes

Suggested reviewers

• tddang-linagora
• hoangdat

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and concisely describes the main change: adding a 'Label as' option to email context menus in lists, which matches the core functionality demonstrated across multiple files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch features/add-label-as-to-context-menu-of-each-email-in-list

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[github-actions]

This PR has been deployed to https://linagora.github.io/tmail-flutter/4312.

[hoangdat]

rebase this also with sprint/label-mar