Add files via upload

## Breaking Changes

**Important:** This release is only compatible with SimpleSAMLphp 2.2.2 and higher due to the required `formURL` variable. 
Users on SimpleSAMLphp 2.2.1 and earlier should remain on theme version 0.2.1.


## Major Changes

### Complete CSP Strict Compliance
- Removed all inline event handlers and replaced with data attributes
- Eliminated all inline scripts - moved to external files (theme-init.js)
- Removed all inline styles in favor of CSS classes
- Full compatibility with Content Security Policy strict mode without requiring nonces

### JavaScript Architecture Overhaul
- Unified all JavaScript functionality into single `theme-bundle.js` file
- Added separate `theme-init.js` for immediate theme application (prevents flash)
- Reduced HTTP requests from 5+ files to 2 core bundles
- Exposed `window.SimpleSAMLTheme` object for external integrations

### UI/UX Design Improvements
- Simplified theme switcher to dark/light modes only (removed auto mode)
- Modernized password visibility toggle with minimal 18x18px icon design
- Wider alert containers (600px) for better error message readability
- Consistent button heights across all navigation elements
- Changed error alerts to use danger styling (red) instead of warning (yellow)

### Form Compatibility Updates
- Updated form action to use `formURL` variable instead of `moduleURL()` function
- Compatible with SimpleSAMLphp 2.2+ form handling
- Dynamic username placeholder when `forceUsername` is active

### Bootstrap Framework Update
- Updated from Bootstrap 5.3.2 to Bootstrap 5.3.8

## New Features

- Keyboard accessibility for password visibility toggle
- Form validation with submit button state management
- Auto-dismiss feature for dismissible alerts after 10 seconds
- Development mode logging for easier debugging

## Compatibility Matrix

| SimpleSAMLphp Version | Theme Version | Compatibility |
|-----------------------|---------------|---------------|
| 2.0.x - 2.2.1        | 0.2.1         | Full          |
| 2.2.2+               | 0.4.0         | Full          |

Author: disisto

bootstrap/public/assets/css/sign-in.css

@@ -0,0 +1,146 @@
+/*
+ * SimpleSAMLphp Bootstrap Theme
+ * Version 0.4.0
+ *
+ * SimpleSAMLphp Bootstrap Theme is a child theme for SimpleSAMLphp that outputs certain visitor facing
+ * pages via Bootstrap front-end framework. Intended to deliver a seamless look and feel when the
+ * visitor already comes from a project based on a Bootstrap layout.
+ *
+ * Documentation: https://github.com/disisto/simplesamlphp-bootstrap-theme
+ *
+ *
+ * Licensed under MIT (https://github.com/disisto/simplesamlphp-bootstrap-theme/blob/main/LICENSE)
+ *
+ * Copyright (c) 2023-2025 Roberto Di Sisto
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+html,
+body {
+  height: 100%;
+}
+
+.form-signin {
+  max-width: 330px;
+  padding: 1rem;
+}
+
+.alert-container {
+  max-width: 600px;
+  margin: 0 auto;
+  padding: 0 1rem;
+}
+
+.alert-container .alert {
+  margin-bottom: 1.5rem;
+}
+
+.form-signin .form-floating:focus-within {
+  z-index: 2;
+}
+
+.form-signin input[type="email"] {
+  margin-bottom: -1px;
+  border-bottom-right-radius: 0;
+  border-bottom-left-radius: 0;
+}
+
+.form-signin input[type="password"] {
+  margin-bottom: 10px;
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
+.dropdown-menu.dropdown-menu-lang {
+  max-height: 550px;
+  overflow-y: auto;
+  right: 0;
+  transform: translateX(36%);
+
+}
+
+.dropdown-menu.dropdown-menu-theme {
+}
+
+.custom-input {
+  height: 40px;
+}
+
+.custom-textarea {
+  height: 100px;
+}
+
+#bd-theme-toggle .theme-icon-active {
+  transition: fill 0.2s ease;
+}
+
+.form-signin input[type="text"].form-control {
+  margin-bottom: 10px;
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
+.password-wrapper {
+  position: relative;
+}
+
+.password-wrapper .form-floating {
+  margin-bottom: 0;
+}
+
+.password-toggle {
+  position: absolute;
+  top: 50%;
+  right: 16px;
+  transform: translateY(-50%);
+  cursor: pointer;
+  padding: 6px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 10;
+  line-height: 1;
+  user-select: none;
+}
+
+.eye-icon {
+  width: 18px;
+  height: 18px;
+  opacity: 0.3;
+  transition: opacity 0.2s ease;
+  display: block;
+  color: #6c757d;
+}
+
+.password-toggle:hover .eye-icon {
+  opacity: 0.5;
+}
+
+.password-wrapper .form-control {
+  padding-right: 46px;
+}
+
+.password-wrapper .form-floating > .form-control {
+  padding-right: 46px;
+}
+
+.password-wrapper .form-floating > label {
+  z-index: 5;
+}