Update CHANGELOG.md

Highlights:

- Support for arcanas
- Support for multiple conversations.
- Added profile window
- Improved LaTeX rendering with simplified code and markdown fixes.
- UI Support for scale-to-zero models.
- Model status popups for unavailable models.
- Code copy button added for responses.
- UI fixes: Responsive width, improved profile pop-ups, and settings flow.

Fixes:
- Retry button path fixed.
- LaTeX bugs resolved and libraries optimized.
- Markdown handling improved.
- First name typo corrected.

Features:

- No token limit: Unlimited tokens can now be used.
- Image upload: Upload and export images via clipboard or drag-and-drop.
- CSV upload: Direct CSV file uploads supported.
- Model status: Added status indicators (e.g., active, loading).
- Temporary model execution: Run models temporarily, even if inactive.

UI Updates:
- Clipart added: Near model selection to show image upload area.

Update CHANGELOG.md to v0.6.2

Features:

- Sharing model and settings with base64-encoded URL parameter
- Importing external settings, i.e., personas

UI Updates:
- Made scrollbar for model selection more visible
- Fixed header issue on tablet-size screens
- Improved overall design of options section

Improvements:

- Fixed memory leak by switching to react-syntax-highlighter.
- Removed unnecessary libraries to boost performance.

UI Updates:
- Default zoom set to 90%.
- Minor fixes: Clear history toast, removed system prompt edit button, added "Do not show again" for history.

Features:
- Added sliders for top_p and temperature adjustments.
- Merged custom configuration page into main interface.
- Export/Import settings as JSON for quick setup.

PDF/TXT Export:
- Improved PDF layout.
- Added endnotes with temperature, top_p, and model name.

Extras:
- Prompt resending/editing enabled.
- Removed unnecessary announcement bar.