feat: themed + iconed UI polish (v0.3.1)
Fluent light/dark theme dictionaries (accent/surface/card/border/danger),
OS-following variant, App-level text/button/card styles. Per-protocol vector
icons via ProtocolIdToIconConverter (mirrors StatusKindToBrushConverter,
view-layer, safe fallback, no external assets). Curated layout across
dashboard/detail/config: consistent spacing scale, card grouping, theme brushes,
accent/danger buttons. App-only; no VM contract change, no new NuGet, no fw bump.
Projects: Junction.App (+ Junction.Tests: +10 converter tests, 148 pass).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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