fix: Restore all files lost during destructive rebase

A previous `git pull --rebase origin main` dropped 177 local commits,
losing 3400+ files across admin-v2, backend, studio-v2, website,
klausur-service, and many other services. The partial restore attempt
(660295e2) only recovered some files.

This commit restores all missing files from pre-rebase ref 98933f5e
while preserving post-rebase additions (night-scheduler, night-mode UI,
NightModeWidget dashboard integration).

Restored features include:
- AI Module Sidebar (FAB), OCR Labeling, OCR Compare
- GPU Dashboard, RAG Pipeline, Magic Help
- Klausur-Korrektur (8 files), Abitur-Archiv (5+ files)
- Companion, Zeugnisse-Crawler, Screen Flow
- Full backend, studio-v2, website, klausur-service
- All compliance SDKs, agent-core, voice-service
- CI/CD configs, documentation, scripts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/frontend/modules/widgets/notizen_widget.py

@@ -0,0 +1,182 @@
+"""
+Notizen Widget fuer das Lehrer-Dashboard.
+
+Zeigt ein einfaches Notizfeld mit localStorage-Persistierung.
+"""
+
+
+class NotizenWidget:
+    widget_id = 'notizen'
+    widget_name = 'Notizen'
+    widget_icon = '📋'  # Clipboard
+    widget_color = '#fbbf24'  # Yellow
+    default_width = 'half'
+    has_settings = False
+
+    @staticmethod
+    def get_css() -> str:
+        return """
+/* ===== Notizen Widget Styles ===== */
+.widget-notizen {
+    background: var(--bp-surface, #1e293b);
+    border: 1px solid var(--bp-border, #475569);
+    border-radius: 12px;
+    padding: 16px;
+    height: 100%;
+    display: flex;
+    flex-direction: column;
+}
+
+.widget-notizen .widget-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    margin-bottom: 12px;
+}
+
+.widget-notizen .widget-title {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    font-size: 14px;
+    font-weight: 600;
+    color: var(--bp-text, #e5e7eb);
+}
+
+.widget-notizen .widget-icon {
+    width: 28px;
+    height: 28px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    background: rgba(251, 191, 36, 0.15);
+    color: #fbbf24;
+    border-radius: 8px;
+    font-size: 14px;
+}
+
+.widget-notizen .notizen-save-indicator {
+    font-size: 11px;
+    color: var(--bp-text-muted, #9ca3af);
+    opacity: 0;
+    transition: opacity 0.3s;
+}
+
+.widget-notizen .notizen-save-indicator.visible {
+    opacity: 1;
+}
+
+.widget-notizen .notizen-textarea {
+    flex: 1;
+    width: 100%;
+    min-height: 120px;
+    background: var(--bp-bg, #0f172a);
+    border: 1px solid var(--bp-border, #475569);
+    border-radius: 8px;
+    padding: 12px;
+    font-size: 13px;
+    font-family: inherit;
+    color: var(--bp-text, #e5e7eb);
+    resize: none;
+    outline: none;
+    transition: border-color 0.2s;
+    line-height: 1.5;
+}
+
+.widget-notizen .notizen-textarea:focus {
+    border-color: #fbbf24;
+}
+
+.widget-notizen .notizen-textarea::placeholder {
+    color: var(--bp-text-muted, #9ca3af);
+}
+
+.widget-notizen .notizen-footer {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-top: 8px;
+    font-size: 11px;
+    color: var(--bp-text-muted, #9ca3af);
+}
+
+.widget-notizen .notizen-char-count {
+    opacity: 0.7;
+}
+"""
+
+    @staticmethod
+    def get_html() -> str:
+        return """
+<div class="widget-notizen" data-widget-id="notizen">
+    <div class="widget-header">
+        <div class="widget-title">
+            <span class="widget-icon">&#128203;</span>
+            <span>Schnelle Notizen</span>
+        </div>
+        <span class="notizen-save-indicator" id="notizen-save-indicator">Gespeichert</span>
+    </div>
+    <textarea class="notizen-textarea" id="notizen-textarea" placeholder="Schreiben Sie hier Ihre Notizen..."></textarea>
+    <div class="notizen-footer">
+        <span class="notizen-char-count" id="notizen-char-count">0 Zeichen</span>
+    </div>
+</div>
+"""
+
+    @staticmethod
+    def get_js() -> str:
+        return """
+// ===== Notizen Widget JavaScript =====
+const NOTIZEN_STORAGE_KEY = 'bp-lehrer-notizen';
+let notizenSaveTimeout = null;
+
+function loadNotizen() {
+    const stored = localStorage.getItem(NOTIZEN_STORAGE_KEY);
+    return stored || '';
+}
+
+function saveNotizen(text) {
+    localStorage.setItem(NOTIZEN_STORAGE_KEY, text);
+    showNotizenSaved();
+}
+
+function showNotizenSaved() {
+    const indicator = document.getElementById('notizen-save-indicator');
+    if (indicator) {
+        indicator.classList.add('visible');
+        setTimeout(() => {
+            indicator.classList.remove('visible');
+        }, 2000);
+    }
+}
+
+function updateNotizenCharCount() {
+    const textarea = document.getElementById('notizen-textarea');
+    const counter = document.getElementById('notizen-char-count');
+    if (textarea && counter) {
+        counter.textContent = textarea.value.length + ' Zeichen';
+    }
+}
+
+function initNotizenWidget() {
+    const textarea = document.getElementById('notizen-textarea');
+    if (!textarea) return;
+
+    // Load saved notes
+    textarea.value = loadNotizen();
+    updateNotizenCharCount();
+
+    // Auto-save on input with debounce
+    textarea.addEventListener('input', function() {
+        updateNotizenCharCount();
+
+        if (notizenSaveTimeout) {
+            clearTimeout(notizenSaveTimeout);
+        }
+
+        notizenSaveTimeout = setTimeout(() => {
+            saveNotizen(textarea.value);
+        }, 500);
+    });
+}
+"""