fix: improve the link menu in read-only mode

[asjqkkkk]

Feature Preview

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

Summary by Sourcery

Centralize read-only handling in link menus by introducing an editable flag, disabling interactive actions and popovers while preserving copy functionality.

Bug Fixes:

• Disable convert, edit, remove, and more-option popovers when the editor is in read-only mode.
• Restrict mention and custom link preview menus to only allow the copy action in read-only mode.

Enhancements:

• Introduce an editable flag in link and mention widgets to toggle interactive behavior based on editor state.
• Add a getTapCallback utility and transparent hover styling to centrally disable buttons in read-only mode.
• Propagate the editable state through link embed, hover, and mention components to unify behavior across menus.

[sourcery-ai]

Reviewer's Guide

This PR introduces a unified read‐only mode across all link menus by propagating the editor’s editable state into each menu widget and conditionally disabling or styling interactive elements when not editable.

File-Level Changes

Change	Details	Files
Propagate editable state into link widgets	Add bool get editable => editorState.editable getters Pass editable flag through widget constructors	link_embed_menu.dart link_hover_menu.dart mention_link_preview.dart link_preview_menu.dart mention_link_block.dart mention_link_error_preview.dart
Conditionally disable callbacks in read‐only mode	Implement getTapCallback to return null when non-editable Replace direct onPressed/onTap assignments with getTapCallback	link_embed_menu.dart link_hover_menu.dart
Refactor convert & more option buttons in LinkEmbedMenu	Extract local button variable in buildConvertButton/buildMoreOptionButton Use button as the popover child when editable	link_embed_menu.dart
Disable non-edit commands and hover styling in preview menus	Set hoverColor: Colors.transparent for disabled buttons Conditionally nullify onTap for menu entries except copyLink	link_hover_menu.dart mention_link_preview.dart link_preview_menu.dart

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[sourcery-ai]

Hey @asjqkkkk - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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