v0.3.0-rc1

Enhancements

• Update category icons in Construct page.
• Rewrite concatenation status construction logic in Construct page.

Fixes

• Fix that Vn/Cn may be omitted unexpectedly
• Fix that formative may start with long stop consonant

CI & Package

• Bump flutter_lints from 2.0.1 to 3.0.1
• Bump package_info_plus from 4.0.2 to 5.0.1
• Bump file_picker from 5.3.2 to 6.1.1
• Bump path_provider from 2.0.15 to 2.1.2
• Bump shared_preferences from 2.2.0 to 2.2.2
• Bump provider from 6.0.5 to 6.1.1