fix: resolve various UI and functionality issues in paint editor, layers, and import

[hm21]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/hm21/pro_image_editor/blob/stable/CONTRIBUTING.md#style-guides
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: #282

What is the new behavior?

• FIX(paint-editor): Ensure bottombar selection updates in UI when changed.
• FIX(paint-editor): Correct appBar canRedo to use the proper function instead of canUndo.
• FIX(layer): Resolve issue where selecting layers that overlap did not function as expected. Resolves issue #282
• FIX(import): Resolve issue where transformations exported from the crop-rotate editor were not properly imported.

Does this PR introduce a breaking change?

• Yes
• No

Other information