Reduce prominence of GitHub CTA and improve login page hierarchy

[JuergGood]

• Removed GitHub CTA from brand logo, repositioned to footer in login page.
• accessibility.
• Added acceptance confirmation to task documentation for verification.

UX / UI Change PR

Scope

• Dark mode
• Mobile layout
• Tables/logs/admin views
• Tasks/list layouts
• Other:

Acceptance criteria (must be explicit)

What changed (systemic first)

• Tokens/theme:
• Shared components/styles:
• Component-specific changes (only if necessary):

Screens / viewports verified

• Mobile 375×667 light
• Mobile 375×667 dark
• Desktop 1440×900 light
• Desktop 1440×900 dark

UX Regression Checklist (must all be ✅)

Theme & contrast

• Action icons visible in dark mode (incl. mat-icon-button + destructive actions)
• Menus/dialogs/selects have readable contrast in dark mode
• Focus ring visible (keyboard navigation)

Mobile space & layout

• Header density acceptable (content above the fold on 375×667)
• No unintended horizontal scrolling on mobile

Responsive patterns

• Tables on mobile: cards or usable scroll (no clipped headers)
• Toolbars/filters don’t create orphan controls / accidental wraps
• Titles don’t break mid-word; truncation/wrapping intentional

Maintainability

• No new hardcoded hex colors (unless added to tokens)
• No new !important (or justified below)

Justifications (required if any)

• New !important added because:
• Component-specific workaround added because: