Replaces the 3-section top row with a compact sticky top bar containing session
name input and settings dropdown (Load Session, Load Config, Save Config, toggles
for Auto-Save, Distribution, Label Mode, Include None/Default, and Refresh Models).
Adds left sidebar with navigation icons (scroll to Global Prompts, Config Arrays,
Distribution, JSON Preview) and quick action buttons (Add Config, Refresh Models).
Sidebar highlights active section via scroll spy.
All section headers now use uniform styling: 16px bold white text on a subtle
gradient bar with colored left accent stripe. Distribution settings render as a
standalone full-width section when enabled.
Improved dark mode contrast: brighter labels (#ccc), brighter input borders (#555),
brighter button text (#e0e0e0), brighter primary buttons (#0077dd).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
