Add Template Management Tab, Enhance Editor UI, and Introduce Sparkle Icon Variants

[ComputelessComputer]

• Added new sparkle icon variants for better design flexibility.
• Enhanced the editor’s floating button with popover-based template selection and improved function naming.
• Introduced a new “Templates” tab in settings for managing custom templates, including editing, deleting, and UI improvements.
• Upgraded the template section UI with better styling, alignment, and usability.
• Added a quick-access “Create new template” button to streamline template creation.