fix(admin): mobile UX fixes — contrast, scroll, responsive grids
- CSS: `.nav-mobile a` → `.nav-mobile a:not(.nav-auth-btn)` to fix Sign
Out button showing slate text instead of white on mobile
- base_admin.html: add `overflow-y: hidden` + `scrollbar-width: none` to
`.admin-subnav` to eliminate ghost 1px scrollbar on Content tab row
- routes.py: pass `outreach_email=EMAIL_ADDRESSES["outreach"]` to outreach
template so sending domain is no longer hardcoded
- outreach.html: display dynamic `outreach_email`; replace inline
`repeat(6,1fr)` grid with responsive `.pipeline-status-grid` (2→3→6 cols)
- index.html: replace inline `repeat(5,1fr)` Lead/Supplier Funnel grids
with responsive `.funnel-grid` class (2 cols mobile, 5 cols md+)
- pipeline.html: replace inline `repeat(4,1fr)` stat grid with responsive
`.pipeline-stat-grid` (2 cols mobile, 4 cols md+)
- 4 partials (lead/email/supplier/outreach results): wrap `<table>` in
`<div style="overflow-x:auto">` so tables scroll on narrow screens
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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