chore: upgrade to bootstrap 5

[eduardosmaniotto]

Summary

Upgrades Bootstrap 4.6.1 → 5.3.8 and refactors CSS/SCSS layer to remove bare-element @extend of Bootstrap classes, replacing them with explicit classes in Razor markup. Hardcoded color values are replaced with CSS custom properties.

Most of the diff is related to replacing the library, not actual code changes.

Changes

• Bootstrap 4 → 5 — swapped bootstrap-4.6.1/ for bootstrap-5.3.8/ in shared styles; rebuilt shared.css
• Removed bare-element @extend — SCSS no longer uses @extend .btn, @extend .table, @extend .form-control, @extend .btn-sm, or @extend of utility classes on bare elements (button, table, form input, th input, tbody button). These are now applied as explicit class="..." attributes in Razor markup
• Removed bare-table CSS reset for QuickGrid — the old table { @extend .table; } rule was removed; QuickGrid tables instead use explicit .table classes where needed and .quickgrid-scoped styles for padding and zebra striping
• Removed bare-select/button extends — SCSS no longer forces Bootstrap form-control/btn classes on every <select> or <button>; each component declares its own classes
• Direct Bootstrap classes in Razor — all <table>, <button>, <input>, <select> elements throughout the admin panel, map, shared components, and forms now carry explicit class="..." attributes
• CSS custom properties — hardcoded colors (#0366d6, #ff0, #f7f7f7, #d6d5d5, #0087ff, #dc3545, etc.) replaced with --omu-* variables or Bootstrap CSS variables (var(--bs-*))
• Migrated theme.css → Theme.scss — converted the existing plain-CSS theme file into a SCSS module. All --omu-* design tokens are now driven by SCSS maps ($omu-light, $omu-dark) and emitted via a @mixin omu-theme-vars under :root / [data-theme="dark"].
• Dark mode improvements — form-select dropdown arrow uses a light-colored SVG via --bs-form-select-bg-img override; form-control::placeholder color set explicitly; sidebar nav-link color overridden to prevent [data-theme="dark"] a:not(.btn) from forcing blue on sidebar links
• Media query breakpoints — standardised to Bootstrap md boundary (768px / 767.98px)
• Dead code removal — Map.scss deleted (.livemap grid overridden by scoped Map.razor.css); unused Bootstrap variable overrides, lds-roller spinner, duplicate #blazor-error-ui, commented-out rules removed from Common.scss, Main.scss
• Sidebar dropdown — Game Configuration submenu toggles via Blazor @onclick (no Bootstrap JS); dropdown uses default display: none with .show → display: block; position: relative; width: 100%; caret rotates via ::after transition. Responsive breakpoint for sidebar collapse aligned to 768px

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request modernizes the project's frontend by upgrading to Bootstrap 5.3.8. The changes focus on improving maintainability and styling consistency by moving away from implicit SCSS @extend patterns toward explicit class-based styling in Razor components. Additionally, the introduction of CSS custom properties and a new SCSS-based theme system enhances support for theming and dark mode.

Highlights

• Bootstrap Upgrade: Upgraded Bootstrap from 4.6.1 to 5.3.8, requiring significant CSS/SCSS refactoring.
• CSS/SCSS Refactoring: Removed bare-element @extend directives in favor of explicit class application in Razor markup, and replaced hardcoded colors with CSS custom properties.
• Theme System: Migrated theme.css to a SCSS module with support for light/dark themes via CSS variables.
• UI Cleanup: Standardized media query breakpoints, removed dead code, and improved sidebar dropdown functionality.

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[gemini-code-assist]

Code Review

This pull request upgrades the project's styling from Bootstrap 4 to Bootstrap 5.3.8, introduces a dark mode theme, and updates various Blazor components to use modern utility classes. The code review identified several actionable improvements: adding type="button" to a Cancel button in ModalObjectSelection.razor to prevent accidental form submissions, correcting an excessively large margin class (me-5 instead of me-1) in EditConfigGrid.razor, adding @onclick:stopPropagation to nested <details> elements inside labels to prevent event bubbling, and replacing standard HTML onclick attributes with Blazor's @onclick directive in PasswordHashField.razor.

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