Fix mobile dashboard header and tab nav layout

[unjica]

Summary

• Rework dashboard top nav for mobile: compact logo, two-row layout, horizontally scrollable scope pickers and tab bar with hidden scrollbars.
• Fix Overview greeting to show a short first name (e.g. "Sanja") instead of a full email, with truncation as a fallback.
• Clamp error titles to 2–3 lines in issue lists and open-issues cards; keep full messages on the error detail page.
• Collapse Filters & sort on mobile (collapsed by default) while keeping it always visible on desktop.
• Audit Events/Sessions tables, error detail metadata, and PageTitle for break-all / line-clamp overflow handling.

Test plan

• pnpm lint && pnpm test && pnpm build
• Overview greeting shows first name on narrow viewport
• Issues list cards clamp long error messages to ~3 lines
• Navbar tabs and scope pickers scroll horizontally on mobile
• Filters panel collapsed on mobile, expanded on desktop
• Error detail page still shows full message in summary panel