fix: add tier limits display and improve buttons in AdminUserRestrictionsPage

Added tier limits column:
- Shows current tier-limit value for each feature
- Loads from tier-limits matrix based on user's tier
- Visual display for boolean (✓ AN / ✗ AUS) and count features
- Clear comparison: Tier-Limit vs Override-Wert

Added per-feature reset button:
- "↺ Zurück zu Standard" button per feature
- Only shown when override exists
- Removes override with single click

Improved bottom bar buttons:
- Renamed "Zurücksetzen" to "Abbrechen" (clearer)
- Always visible (not hidden when no changes)
- Disabled state when no changes
- Shows "Keine Änderungen" when nothing to save

Better UX:
- Tier-Limit column shows what user gets without override
- Override input highlighted when active (accent-light background)
- Clear action buttons per row
- Global save/cancel at bottom

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

frontend/src/pages/AdminUserRestrictionsPage.jsx

@@ -11,6 +11,7 @@ export default function AdminUserRestrictionsPage() {
   const [selectedUserId, setSelectedUserId] = useState('')
   const [selectedUser, setSelectedUser] = useState(null)
   const [restrictions, setRestrictions] = useState([])
+  const [tierLimits, setTierLimits] = useState({})
   const [changes, setChanges] = useState({})
   const [saving, setSaving] = useState(false)
 
@@ -47,12 +48,24 @@ export default function AdminUserRestrictionsPage() {
 
   async function loadUserData(userId) {
     try {
-      const [user, restrictionsData] = await Promise.all([
+      const [user, restrictionsData, limitsMatrix] = await Promise.all([
         api.adminListProfiles().then(users => users.find(u => u.id === userId)),
-        api.listUserRestrictions(userId)
+        api.listUserRestrictions(userId),
+        api.getTierLimitsMatrix()
       ])
+
       setSelectedUser(user)
       setRestrictions(restrictionsData)
+
+      // Build tier limits lookup for this user's tier
+      const userTier = user.tier || 'free'
+      const limits = {}
+      features.forEach(feature => {
+        const key = `${userTier}:${feature.id}`
+        limits[feature.id] = limitsMatrix.limits[key] ?? feature.default_limit
+      })
+      setTierLimits(limits)
+
       setChanges({})
       setError('')
       setSuccess('')
@@ -312,14 +325,17 @@ export default function AdminUserRestrictionsPage() {
             <table style={{ width: '100%', borderCollapse: 'collapse', fontSize: 13 }}>
               <thead>
                 <tr style={{ background: 'var(--surface2)' }}>
-                  <th style={{ textAlign: 'left', padding: '12px 16px', fontWeight: 600, width: '40%' }}>
+                  <th style={{ textAlign: 'left', padding: '12px 16px', fontWeight: 600 }}>
                     Feature
                   </th>
-                  <th style={{ textAlign: 'center', padding: '12px 16px', fontWeight: 600, width: '30%' }}>
+                  <th style={{ textAlign: 'center', padding: '12px 16px', fontWeight: 600 }}>
+                    Tier-Limit
+                  </th>
+                  <th style={{ textAlign: 'center', padding: '12px 16px', fontWeight: 600 }}>
                     Override-Wert
                   </th>
-                  <th style={{ textAlign: 'right', padding: '12px 16px', fontWeight: 600, width: '30%' }}>
+                  <th style={{ textAlign: 'right', padding: '12px 16px', fontWeight: 600 }}>
-                    Status
+                    Aktion
                   </th>
                 </tr>
               </thead>
@@ -328,7 +344,7 @@ export default function AdminUserRestrictionsPage() {
                   <>
                     {/* Category Header */}
                     <tr key={`cat-${category}`} style={{ background: 'var(--accent-light)' }}>
-                      <td colSpan={3} style={{
+                      <td colSpan={4} style={{
                         padding: '8px 16px', fontWeight: 600, fontSize: 11,
                         textTransform: 'uppercase', letterSpacing: '0.5px',
                         color: 'var(--accent-dark)'
@@ -357,6 +373,24 @@ export default function AdminUserRestrictionsPage() {
                             </div>
                           </td>
 
+                          {/* Tier-Limit */}
+                          <td style={{ padding: '12px 16px', textAlign: 'center' }}>
+                            {feature.limit_type === 'boolean' ? (
+                              <span style={{
+                                padding: '6px 12px', borderRadius: 20,
+                                background: tierLimits[feature.id] !== 0 ? 'var(--accent-light)' : 'var(--surface2)',
+                                color: tierLimits[feature.id] !== 0 ? 'var(--accent-dark)' : 'var(--text3)',
+                                fontSize: 12, fontWeight: 600
+                              }}>
+                                {tierLimits[feature.id] !== 0 ? '✓ AN' : '✗ AUS'}
+                              </span>
+                            ) : (
+                              <span style={{ fontWeight: 500, color: 'var(--text2)' }}>
+                                {tierLimits[feature.id] === null ? '∞' : tierLimits[feature.id]}
+                              </span>
+                            )}
+                          </td>
+
                           {/* Override Input */}
                           <td style={{ padding: '12px 16px', textAlign: 'center' }}>
                             {feature.limit_type === 'boolean' ? (
@@ -382,36 +416,32 @@ export default function AdminUserRestrictionsPage() {
                                 type="text"
                                 value={displayValue}
                                 onChange={(e) => handleChange(feature.id, e.target.value)}
-                                placeholder="leer = Tier-Standard"
+                                placeholder={override ? "Wert..." : ""}
                                 style={{
-                                  width: '140px',
+                                  width: '100px',
                                   padding: '6px 8px',
-                                  border: `1.5px solid ${changed ? 'var(--accent)' : 'var(--border)'}`,
+                                  border: `1.5px solid ${changed ? 'var(--accent)' : override ? 'var(--accent)' : 'var(--border)'}`,
                                   borderRadius: 6,
                                   textAlign: 'center',
                                   fontSize: 13,
-                                  fontWeight: changed ? 600 : 400,
+                                  fontWeight: override || changed ? 600 : 400,
-                                  background: 'var(--bg)',
+                                  background: override ? 'var(--accent-light)' : 'var(--bg)',
                                   color: displayValue === 0 || displayValue === '0' ? 'var(--danger)' : 'var(--text1)'
                                 }}
                               />
                             )}
                           </td>
 
-                          {/* Status */}
+                          {/* Action */}
                           <td style={{ padding: '12px 16px', textAlign: 'right' }}>
-                            {override ? (
+                            {override && (
-                              <span style={{
+                              <button
-                                padding: '4px 8px', borderRadius: 4, fontSize: 11,
+                                className="btn btn-secondary"
-                                background: 'var(--accent-light)', color: 'var(--accent-dark)',
+                                onClick={() => handleChange(feature.id, '')}
-                                fontWeight: 600
+                                style={{ padding: '4px 8px', fontSize: 11 }}
-                              }}>
+                              >
-                                ✓ Override aktiv
+                                ↺ Zurück zu Standard
-                              </span>
+                              </button>
-                            ) : (
-                              <span style={{ fontSize: 11, color: 'var(--text3)' }}>
-                                Tier-Standard
-                              </span>
                             )}
                           </td>
                         </tr>
@@ -436,7 +466,7 @@ export default function AdminUserRestrictionsPage() {
               disabled={!hasChanges || saving}
               style={{ flex: 1 }}
             >
-              <RotateCcw size={14} /> Zurücksetzen
+              <X size={14} /> Abbrechen
             </button>
             <button
               className="btn btn-primary"
@@ -444,7 +474,7 @@ export default function AdminUserRestrictionsPage() {
               disabled={!hasChanges || saving}
               style={{ flex: 2 }}
             >
-              {saving ? 'Speichern...' : hasChanges ? `${Object.keys(changes).length} Änderung(en) speichern` : 'Speichern'}
+              {saving ? 'Speichern...' : hasChanges ? `${Object.keys(changes).length} Änderung(en) speichern` : 'Keine Änderungen'}
             </button>
           </div>