Reorg edit buttons

[chrissooo]

This PR improves the usability of the note editor by moving the mode switching options (Edit, Preview, Rich Edit) from the title bar/menu directly into the editor view as Floating Action Buttons. This reorganization makes switching between modes more intuitive and accessible, especially during one-handed usage.

Changes

• Simplified Title Bar: Removed mode switching options (Preview/Edit) from the top menu to reduce clutter.
• Floating Action Buttons: Added ExtendedFloatingActionButton for "Preview" and "Rich Edit" directly within the editor fragments.
• Mode Switching:
• Added a "Simple Mode" button in Rich Edit mode.
• Added a "Preview" button in the standard editor.
• Updated the Preview fragment with a prominent edit button.
• UI Refinement: Adjusted margins and positions for consistent button placement across different editor modes.
• Unified Logic: Streamlined the mode switching implementation in SearchableBaseNoteFragment.

🖼️ Screenshots

🏚️ Before
No rch-edit-button:

rich-edit-button present:

🏡 After
No rch-edit-button:

rich-edit-button present:

🏁 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

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 24 complexity · 2 duplication

Metric	Results
Complexity	24
Duplication	2

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[chrissooo]

To may bugs... Sorry