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feat: implement dark mode support (#353)

### Summary      

Add dark mode support to the BootstrapAdminUi bundle using Bootstrap 5.3
color modes.
   
### Features
  - Theme toggle button (sun/moon) in the navbar
- Persistent preference via localStorage with prefers-color-scheme
fallback
  - Anti-flash inline script applied before page paint
  - Login page logo adapts to active theme
  - SCSS refactored to use CSS custom properties (--tblr-*) throughout
  - ApexCharts re-renders on theme change via MutationObserver

### Changes

  - Add theme-switcher.js script
- Add theme.html.twig anti-flash hookable in #stylesheets (priority 200)
  - Add theme_switcher.html.twig navbar button hookable
- Refactor _body.scss, _sidebar.scss, _tom-select.scss with include
color-mode() mixin
- Replace hardcoded colors in _accordion.scss, _filters.scss,
_form.scss, _loader.scss, _navbar.scss
- Update statistics_chart.js to use CSS vars and re-render on theme
change
  - Update login logo template to support both light/dark variants

![Enregistrementdelecran2026-03-14a11 36 42-ezgif
com-video-to-gif-converter](https://github.com/user-attachments/assets/66569358-3886-428e-9f5e-14ac2df4ab3b)

prepare release

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prepare release

prepare release

prepare release

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