feat: Transitions, spacing, scroll fade, prompt area update

[aaroniker]

DONT MERGE, MAKING SMALL FIXES AND IMPROVEMENTS

• Transitions
• Prompt icons updated
• Select, dropdown, popover spacing and other styles updated
• Scroll fade
• ...

[github-actions]

Hey! Your PR title feat(app, ui): Transitions, spacing, scroll fade, prompt area update doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

No duplicate PRs found

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[aaroniker]

@copilot check for portential issues, no minor stuff

[Copilot]

@aaroniker I've opened a new pull request, #11220, to work on those changes. Once the pull request is ready, I'll request review from you.