Fix: move Vexorium header into ChatApp, restore settings+new-chat visibility

Restore settings panel + Vexorium style: src/components/ChatApp.tsx

Simplify logo layout: header Vexorium, right Nemotron only

Add Nemotron × Vexorium logo composition

Vexorium brand: update src/components/FeatureCard.tsx

Vexorium brand: update src/components/AppShell.tsx

Vexorium brand: update src/components/LandingPage.tsx

revert: back to 9b50a208 (reference model) for testing

fix: MessageBubble falls back to reasoning when content is empty — eliminates 'No response'

Add mobile warning (4B model too large for phone VRAM), update landing page branding

Add settings panel with editable system prompt, update examples

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