Reorg edit Buttons

[chrissooo]

This Pull Request reorganizes the action buttons (Edit, Direct Edit, and Preview) within the note editing flow. Previously, these buttons were managed individually within the fragments (NoteEditFragment, NotePreviewFragment, etc.). This change centralizes the button management into the EditNoteActivity.
Changes:

• Centralization: The buttons for editing, previewing, and rich-text editing are now part of the EditNoteActivity layout.
• Layout Upgrade: Updated activity_edit.xml to use a CoordinatorLayout for better control over Floating Action Button (FAB) behavior.
• Dynamic Visibility: Buttons are shown or hidden dynamically based on the current mode (Preview vs. Editor) and server capabilities (Direct Editing support).
• Scroll Behavior: FABs now respond to scroll events and hide/show accordingly using ExtendedFabUtil.
• Menu Cleanup: Removed redundant menu items from the toolbar, as these actions are now prominently handled by the FABs.

🖼️ Videos

🏚️ Before

screen-20260630-163107-1782829835601.1.mp4

🏡 After

screen-20260630-163248-1782829939085.1.mp4

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not needed
• 🔙 Backport requests are created or not needed: /backport to stable-xx.x
• 📅 Milestone is set
• 🌸 PR title is meaningful (if it should be in the changelog: is it meaningful to users?)

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI

Disclosure: I am an external contributor, and this change was developed with the assistance of AI.
Assisted-by: Claude Code 2.1.80 (Claude Sonnet 3.7)

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
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🟢 Metrics 13 complexity · 0 duplication

Metric	Results
Complexity	13
Duplication	0

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