First UI slice toward the product mockups. Shifts the shared MUI theme to match
the mockup identity without restructuring components:
- Default accent -> indigo #6366f1 (drives primary buttons, active nav, and the
Applied/Interview status colours). Users with a custom accent keep theirs.
- Light app background -> #F4F6FB with white paper, giving the layered dashboard
look (cards/inputs sit above a soft grey canvas).
- Global corner radius 8 -> 10 to match the mockups' rounder cards.
- Accent picker: offer indigo/cyan/violet presets first (kept #15803d).
Behaviour-only theme change. Frontend suite: 38/39 pass; the 1 failure
(end-to-end-trust-loop tailored-CV) is pre-existing on this branch (verified by
running it on the clean tree) and unrelated.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
cesnimda
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