Composer v2 polish and improved formatting consistency

This release includes another round of refinements to Composer v2 as we continue the progressive rollout.

Theme-aware text color controls: The text color indicator now adapts correctly to light and dark mode for better visibility and consistency.
Cleaner cursor behavior: The typing cursor now remains clearly visible regardless of selected text color.
Improved link insertion: Fixed an issue that prevented links from being added correctly to pasted text.

These updates continue to refine the composing experience and improve formatting predictability across different themes and workflows.

Thank you for your continued feedback as we keep polishing the new composer experience.

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