fix(webapp): polish AI agent setup panel on tasks blank state (#4807)

Visual-only changes to the Tasks-page onboarding blank state (brand-new
project, dev environment). Formatting, lint, and knip pass via the
pre-push hooks; open the Tasks page for a new project to confirm the
panel, copy button, and step 2 render as intended.

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## Changelog

Polished the "Set it up with your AI agent" onboarding panel:
top-aligned the badge and switched it to the custom Ask AI sparkle icon,
stopped the copy-prompt button from resizing when it swaps to "Copied
prompt" (the bright check icon now sits beside the label), removed the
sparkle from the button's idle state, removed the spinner next to "Start
the dev server", and widened the gap between the panel text and the copy
button.

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## Screenshots
<img width="800" height="643" alt="CleanShot 2026-08-27 at 19 04 43"
src="https://github.com/user-attachments/assets/aede4ca1-30d5-4240-aa18-e1a20161973d"
/>



🤖 Generated with [Claude Code](https://claude.com/claude-code)

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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>