refactor: enhance AI block UI/UX

[DepsCian]

#2104

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Walkthrough

The PR updates multiple frontend components: markdown styles for codeblock actions now use opacity transitions, repositioning, and new icon button styles; the CodeBlock component adds methods and UI to send code to terminal blocks via a context menu and RPC calls; typing indicator SCSS/TSX were reworked into a typed, exportable React component with a bubble/dot animation and style prop; WaveAI chat styles and TSX were reorganized—message layout, model/preset selector, per-message editing/copy actions, and WaveAiModel state were modified (including removal of viewText and addition of noPadding).

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

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