Live theme authoring's core loop — Hermes recolors the skin file it just
activated — repainted the TUI but not the GUI. The event path was fine
(post-#69533 the WS broadcast lands and ingestBackendSkin refreshes the
$backendThemes registry); the same-name apply guard also no-ops correctly
(it's what protects a manual desktop theme pick). The repaint was supposed
to come from the registry: the active theme IS that skin, its palette just
changed. But ThemeProvider memoized deriveTheme on [themeName, resolvedMode]
only, while deriveTheme reads the registry non-reactively via resolveTheme —
so the store update re-rendered the provider and handed back the stale
palette. Name switches repainted (themeName moves); recolors never did.
Add the theme stores (user/backend/registry) to the memo's deps — they are
deriveTheme's actual reactivity, same as the availableThemes memo directly
above. applyTheme is idempotent, and $backendThemes only publishes on a
real palette change, so no spurious repaints.
Tests: render ThemeProvider for real — activation applies; a same-name
recolor repaints (fails without the fix); an inactive-skin seed doesn't
touch the painted theme.
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