diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index 8614099..d3fa27b 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -10,8 +10,24 @@ const manualTopics = ref([])
 const selectedTopic = ref(null)
 const previewGuide = ref(null)
 const showBausteine = ref(false)
+const sidebarPinned = ref(localStorage.getItem('sidebarPinned') !== 'false')
+const sidebarSticky = ref(false)
 let pollTimer = null
 
+function toggleSidebarPin() {
+  sidebarPinned.value = !sidebarPinned.value
+  localStorage.setItem('sidebarPinned', sidebarPinned.value ? 'true' : 'false')
+  if (sidebarPinned.value) sidebarSticky.value = false
+}
+
+function clickHoverZone() {
+  sidebarSticky.value = !sidebarSticky.value
+}
+
+function onSidebarLeave() {
+  if (!sidebarPinned.value) sidebarSticky.value = false
+}
+
 const topics = computed(() => {
   const topicDates = {}
   for (const g of guides.value) {
@@ -25,7 +41,19 @@ const topics = computed(() => {
   return Object.keys(topicDates).sort((a, b) => topicDates[b].localeCompare(topicDates[a]))
 })
 
-const guidesByFormat = computed(() => {
+const doneByFormat = computed(() => {
+  const map = {}
+  for (const g of guides.value) {
+    if (g.topic !== selectedTopic.value) continue
+    if (g.status !== 'done') continue
+    if (!map[g.format] || g.created_at > map[g.format].created_at) {
+      map[g.format] = g
+    }
+  }
+  return map
+})
+
+const latestByFormat = computed(() => {
   const map = {}
   for (const g of guides.value) {
     if (g.topic !== selectedTopic.value) continue
@@ -51,9 +79,9 @@ async function loadGuides() {
 const FORMAT_ORDER = ['OnePager', 'Cheatsheet', 'MiniGuide', 'BeginnerGuide', 'IntermediateGuide', 'ExtendedGuide']
 
 function autoPreview() {
-  const map = guidesByFormat.value
+  const map = doneByFormat.value
   for (const f of FORMAT_ORDER) {
-    if (map[f]?.status === 'done') {
+    if (map[f]) {
       previewGuide.value = map[f]
       return
     }
@@ -164,13 +192,16 @@ onUnmounted(() => {
 </script>
 
 <template>
-  <div class="layout">
+  <div class="layout" :class="{ 'sidebar-floating': !sidebarPinned, 'sidebar-open': sidebarSticky }">
+    <div v-if="!sidebarPinned" class="hover-zone" @click="clickHoverZone"></div>
     <TopicSidebar
       :topics="topics"
       :selectedTopic="selectedTopic"
-      :guidesByFormat="guidesByFormat"
+      :doneByFormat="doneByFormat"
+      :latestByFormat="latestByFormat"
       :allGuides="guides"
       :bausteineActive="showBausteine"
+      :pinned="sidebarPinned"
       @select="selectTopic"
       @create="createTopic"
       @formatClick="handleFormatClick"
@@ -180,6 +211,8 @@ onUnmounted(() => {
       @preview="handlePreview"
       @rework="handleRework"
       @showBausteine="handleShowBausteine"
+      @togglePin="toggleSidebarPin"
+      @sidebarLeave="onSidebarLeave"
     />
     <BausteineView
       v-if="selectedTopic && showBausteine"
@@ -212,6 +245,34 @@ body {
   display: flex;
   height: 100vh;
   overflow: hidden;
+  position: relative;
+}
+
+.hover-zone {
+  position: fixed;
+  left: 0;
+  top: 0;
+  width: 50px;
+  height: 100vh;
+  z-index: 5;
+  cursor: pointer;
+}
+
+.layout.sidebar-floating > .sidebar {
+  position: fixed;
+  left: 0;
+  top: 0;
+  height: 100vh;
+  transform: translateX(-100%);
+  transition: transform 0.2s ease;
+  z-index: 10;
+  box-shadow: 0 0 16px rgba(0, 0, 0, 0.12);
+}
+
+.layout.sidebar-floating .hover-zone:hover ~ .sidebar,
+.layout.sidebar-floating > .sidebar:hover,
+.layout.sidebar-floating.sidebar-open > .sidebar {
+  transform: translateX(0);
 }
 
 .empty-main {
diff --git a/frontend/src/components/TopicSidebar.vue b/frontend/src/components/TopicSidebar.vue
index d172692..bc99f6c 100644
--- a/frontend/src/components/TopicSidebar.vue
+++ b/frontend/src/components/TopicSidebar.vue
@@ -4,12 +4,14 @@ import { ref, computed } from 'vue'
 const props = defineProps({
   topics: { type: Array, required: true },
   selectedTopic: { type: String, default: null },
-  guidesByFormat: { type: Object, default: () => ({}) },
+  doneByFormat: { type: Object, default: () => ({}) },
+  latestByFormat: { type: Object, default: () => ({}) },
   allGuides: { type: Array, default: () => [] },
   bausteineActive: { type: Boolean, default: false },
+  pinned: { type: Boolean, default: true },
 })
 
-const emit = defineEmits(['select', 'create', 'formatClick', 'deleteTopic', 'cancelGuide', 'deleteGuide', 'preview', 'rework', 'showBausteine'])
+const emit = defineEmits(['select', 'create', 'formatClick', 'deleteTopic', 'cancelGuide', 'deleteGuide', 'preview', 'rework', 'showBausteine', 'togglePin', 'sidebarLeave'])
 
 const formats = [
   { key: 'OnePager', label: 'OnePager' },
@@ -27,14 +29,22 @@ const activeGenerations = computed(() => {
 })
 
 function guideStatus(format) {
-  const guide = props.guidesByFormat[format]
-  if (!guide) return 'none'
-  return guide.status
+  if (props.doneByFormat[format]) return 'done'
+  const latest = props.latestByFormat[format]
+  if (!latest) return 'none'
+  if (latest.status === 'error') return 'none'
+  return latest.status
+}
+
+function errorMsg(format) {
+  const latest = props.latestByFormat[format]
+  if (latest?.status === 'error') return latest.error_msg || 'Fehler bei der Generierung'
+  return ''
 }
 
 function handleFormatClick(format) {
-  const guide = props.guidesByFormat[format]
-  if (guide?.status === 'done') {
+  const guide = props.doneByFormat[format]
+  if (guide) {
     emit('preview', guide)
   }
 }
@@ -60,16 +70,33 @@ function handlePlay(format) {
 }
 
 function handleRefresh(format) {
-  const guide = props.guidesByFormat[format]
+  const guide = props.doneByFormat[format]
   if (!guide) return
   const text = activeInput.value === format ? inputText.value.trim() : ''
-  emit('rework', { guideId: guide.id, instructions: text || 'Überarbeite das Layout' })
+  if (!text) return
+  emit('rework', { guideId: guide.id, instructions: text })
   activeInput.value = null
   inputText.value = ''
 }
 
+function handleInputEnter(format) {
+  const text = inputText.value.trim()
+  if (props.doneByFormat[format] && text) {
+    handleRefresh(format)
+  } else {
+    handlePlay(format)
+  }
+}
+
+function dismissError(format) {
+  const latest = props.latestByFormat[format]
+  if (latest?.status === 'error') {
+    emit('deleteGuide', latest.id)
+  }
+}
+
 function handleDelete(format) {
-  const guide = props.guidesByFormat[format]
+  const guide = props.latestByFormat[format]
   if (!guide) return
   if (guide.status === 'generating' || guide.status === 'queued') {
     if (!confirm('Generierung abbrechen?')) return
@@ -91,8 +118,13 @@ function submit() {
 </script>
 
 <template>
-  <aside class="sidebar">
+  <aside class="sidebar" @mouseleave="emit('sidebarLeave')">
     <div class="new-topic">
+      <button
+        class="pin-btn"
+        :title="pinned ? 'Sidebar ausblenden' : 'Sidebar fixieren'"
+        @click="emit('togglePin')"
+      >{{ pinned ? '⇤' : '⇥' }}</button>
       <input
         v-model="newTopic"
         placeholder="Neues Thema…"
@@ -128,16 +160,7 @@ function submit() {
             >&times;</span>
           </button>
           <div class="format-actions">
-            <template v-if="guideStatus(f.key) === 'done'">
-              <button class="action-btn refresh" title="Überarbeiten" @click="handleRefresh(f.key)">↻</button>
-              <button
-                class="action-btn pencil"
-                :class="{ active: activeInput === f.key }"
-                title="Anweisungen"
-                @click="toggleInput(f.key)"
-              >✎</button>
-            </template>
-            <template v-else-if="guideStatus(f.key) !== 'generating' && guideStatus(f.key) !== 'queued'">
+            <template v-if="guideStatus(f.key) !== 'generating' && guideStatus(f.key) !== 'queued'">
               <button class="action-btn play" title="Generieren" @click="handlePlay(f.key)">▶</button>
               <button
                 class="action-btn pencil"
@@ -148,12 +171,23 @@ function submit() {
             </template>
           </div>
         </div>
+        <div v-if="errorMsg(f.key)" class="format-error">
+          <span class="format-error-text">{{ errorMsg(f.key) }}</span>
+          <button class="format-error-x" title="Fehler entfernen" @click="dismissError(f.key)">&times;</button>
+        </div>
         <div v-if="activeInput === f.key" class="format-input">
           <input
             v-model="inputText"
-            :placeholder="guideStatus(f.key) === 'done' ? 'Was soll überarbeitet werden?' : 'Anweisungen (optional)…'"
-            @keyup.enter="guideStatus(f.key) === 'done' ? handleRefresh(f.key) : handlePlay(f.key)"
+            :placeholder="doneByFormat[f.key] ? 'Was soll überarbeitet werden?' : 'Anweisungen (optional)…'"
+            @keyup.enter="handleInputEnter(f.key)"
           />
+          <button
+            v-if="doneByFormat[f.key]"
+            class="action-btn refresh"
+            title="Überarbeiten"
+            :disabled="!inputText.trim()"
+            @click="handleRefresh(f.key)"
+          >↻</button>
         </div>
       </div>
       <div class="bausteine-btn-wrapper">
@@ -214,6 +248,20 @@ function submit() {
   cursor: not-allowed;
 }
 
+.new-topic .pin-btn {
+  background: #f8f9fb;
+  color: #4b5563;
+  border: 1px solid #d8dde3;
+  font-weight: 600;
+  padding: 6px 8px;
+}
+
+.new-topic .pin-btn:hover {
+  background: #ede9fe;
+  color: #4f46e5;
+  border-color: #a5b4fc;
+}
+
 .topic-list {
   list-style: none;
   overflow-y: auto;
@@ -332,10 +380,35 @@ function submit() {
   animation: pulse 1.5s ease-in-out infinite;
 }
 
-.fmt-error .format-name {
+.format-error {
+  display: flex;
+  align-items: flex-start;
+  gap: 4px;
+  padding: 2px 0.75rem 6px calc(0.75rem + 8px);
+  font-size: 0.72rem;
   color: #991b1b;
-  background: #fee2e2;
-  border: 1px solid #f87171;
+  line-height: 1.3;
+}
+
+.format-error-text {
+  flex: 1;
+  word-break: break-word;
+}
+
+.format-error-x {
+  flex: 0 0 auto;
+  background: none;
+  border: none;
+  color: #991b1b;
+  font-size: 1rem;
+  line-height: 1;
+  cursor: pointer;
+  padding: 0 2px;
+  opacity: 0.6;
+}
+
+.format-error-x:hover {
+  opacity: 1;
 }
 
 .format-actions {
@@ -387,11 +460,14 @@ function submit() {
 }
 
 .format-input {
+  display: flex;
+  align-items: center;
+  gap: 4px;
   padding: 4px 0.75rem 8px;
 }
 
 .format-input input {
-  width: 100%;
+  flex: 1;
   padding: 4px 8px;
   border: 1px solid #d8dde3;
   border-radius: 4px;
@@ -403,6 +479,16 @@ function submit() {
   border-color: #6366f1;
 }
 
+.action-btn:disabled {
+  opacity: 0.35;
+  cursor: not-allowed;
+}
+
+.action-btn:disabled:hover {
+  background: none;
+  border-color: transparent;
+}
+
 @keyframes pulse {
   0%, 100% { opacity: 1; }
   50% { opacity: 0.65; }