FLOW-2583: Fix toolbar layout and icon size in prompt box sidebar - (Jira Coding Agent)

[atlassian]

This PR fixes the prompt box toolbar layout issue where it would break into multiple lines when the sidebar is narrow, and addresses the oversized icon and button sizes in the prompt box toolbar.

Key changes:

Area	Change Description
Toolbar Layout	Prevent toolbar wrapping by setting flexWrap to 'nowrap' and allowing toolbar sections to shrink gracefully with minWidth and flexShrink styles.
Icon and Button Sizes	Reduce prompt button and icon sizes from 32px/24px to 24px/16px to avoid oversized appearance. All relevant icons now support a 'small' size prop and are updated accordingly.
CSS Styling	Adjust padding, height, width, gap, and border-radius in CSS for prompt buttons and mode indicators to match new smaller sizes.
Prompt Box Components	Update PromptContextPopup, PromptInputBox, and PromptSettingsPopup components to use smaller icon sizes and improve layout constraints for narrow sidebars.

These changes improve the visual consistency and usability of the prompt box toolbar, especially in narrow sidebar contexts, ensuring a cleaner and more compact UI.

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