fix(web): restore Alpine theme members and allow eval for Alpine expressions

Two regressions from the cleanup cycle, caught in E2E:

1. The unexport pass stripped loadTheme, loadUserTheme, and
   updateThemeIndicators from the Alpine.data("theme") registration —
   the member-removal pass could not tell export-block lines from
   Alpine component object lines. Theme dropdowns on docs and
   non-app pages stopped reflecting the active theme. Members
   restored (functions were kept, only their scope registration was
   lost).

2. The new Content-Security-Policy shipped script-src without
   'unsafe-eval'. Alpine evaluates every @click / x-init / x-show
   expression through new Function(), so the CSP silently disabled
   ALL Alpine interactivity app-wide: sidebar categories stuck open,
   modals rendering unhidden and unresponsive, dropdowns inert.
   script-src now includes 'unsafe-eval' with a comment explaining
   the Alpine requirement.

web/src/theme.ts

@@ -288,8 +288,11 @@ Alpine.data("theme", () => ({
   changeTheme,
   changeWoodPaneling,
   initializeTheme,
+  loadTheme,
+  loadUserTheme,
   loadWoodPaneling,
   revealCurrentTheme,
+  updateThemeIndicators,
   updateWoodPanelingIndicators,
 }));