Move Raw JSON button to the user/assistant+time row, and make the header a bit more responsive

[bl-ue]

Summary by CodeRabbit

• New Features

  • Added an Info button to each message that opens an interactive dialog displaying the complete raw JSON data representation with syntax highlighting support.

• Style

  • Improved the header layout spacing and alignment distribution for better section organization.
  • Adjusted message spacing and margins throughout the interface to enhance visual presentation and overall consistency.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Changes add a .gitignore entry, refine AppHeader layout spacing and alignment by adjusting flex properties, and introduce an Info dialog button in HomeDashboard to display raw JSON representations of messages using CodeMirror.

Changes

Cohort / File(s)	Summary
Configuration .gitignore	Adds ratarget to the ignore list alongside the existing target directory exclusion.
Header Layout frontend/src/components/layout/AppHeader.tsx	Adds justify-between class to the top-level container for distributed spacing between left and right sections; removes unused center spacer div; changes left subsection from flex-1 to flex.
Message Viewer Feature frontend/src/pages/HomeDashboard.tsx	Adds Info button with Dialog displaying raw JSON of messages via CodeMirror; relocates button to header row alongside timestamp; consolidates duplicated button placement; adjusts message spacing by reducing margins on header and text blocks.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 A button clicks, JSON takes flight,
The header breathes with balanced might,
No more duplicates cluttering the way,
And targets hidden—out of display! 🎉

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main changes: relocating the Raw JSON button to the message header row and improving layout responsiveness in AppHeader.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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