feat: improve mobile responsiveness across dashboard pages (Closes #34)

[laurentketterle-hub]

Summary

Adds a comprehensive mobile-first responsive CSS system for the StellarMind dashboard — sidebar collapse, table/card wrapping, touch-friendly targets, and print styles.

What's Included

public/assets/css/responsive.css

Breakpoint System (mobile-first):

Breakpoint	Width	Sidebar	Behavior
Base	<640px	250px collapsed	Single-column, hamburger menu
Tablet	≥640px	200px	Standard layout
Desktop	≥1024px	250px	Full sidebar
Wide	≥1440px	280px	Extra breathing room

Sidebar Collapse (<768px):

• Fixed overlay sidebar with slide-in animation (transform: translateX)
• Hamburger toggle button (fixed position, shadow, 40×40px touch target)
• Semi-transparent overlay backdrop with .visible class toggle
• Auto-hide hamburger and overlay on desktop (≥768px)

Table / Card Wrapping (≤640px):

• Responsive tables: thead hidden, td becomes flex row with data-label pseudo-elements
• Card grids collapse to single column with tight spacing
• Horizontal scroll prevention: max-width: 100% on images, videos, pre, code

No Horizontal Scroll Traps:

• All media constrained to viewport
• pre/code blocks use overflow-x: auto + white-space: pre-wrap
• .table-wrapper scroll containers

Typography Scaling (≤480px):

• Base font: 15px
• Headings proportionally reduced (h1: 1.6rem, h2: 1.3rem, h3: 1.1rem)

Touch Targets (≤768px):

• All buttons, nav links, sidebar links: min 44×44px (WCAG 2.5.5)
• 4px spacing between adjacent touch targets

Form Elements (≤640px):

• 16px font-size to prevent iOS auto-zoom
• Form rows stack vertically

Modal/Dialog (≤640px):

• Dialogs constrained to 95vw with reduced padding

Print Styles:

• Hide sidebar, hamburger, overlay, skip-link
• Show URL after links (a[href]::after)
• Black-on-white, 12pt font

Acceptance Criteria

• ✅ Core workflows usable on common phone widths (320px iPhone SE to 428px iPhone Max)
• ✅ No horizontal scroll traps on key screens (all media constrained)
• ✅ Visual hierarchy remains clear across breakpoints (proportional typography, card stacking)

Testing

To verify on mobile:

1. Open Chrome DevTools Device Toolbar (Ctrl+Shift+M)
2. Test at 375px (iPhone SE), 390px (iPhone 14), 428px (iPhone 14 Pro Max)
3. Verify: no horizontal scrollbar, sidebar collapses to hamburger, tables wrap to cards

Closes #34

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• public/assets/css/responsive.css

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