feat: enhance dashboard and exercises list UI with new styles and filtering options

- Added responsive styles for dashboard KPI cards and exercise search actions, improving layout on smaller screens.
- Refactored the Dashboard component to streamline error handling and loading states for better user experience.
- Updated ExercisesListPage to include new filtering options for user-created exercises, enhancing data relevance.
- Improved overall CSS organization and introduced new classes for better styling consistency across components.

frontend/src/app.css

@@ -2706,6 +2706,21 @@ a.analysis-split__nav-item {
   gap: 10px;
   margin-top: 12px;
 }
+.exercise-search-bar__actions--split {
+  width: 100%;
+}
+.exercise-search-bar__actions-main {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 10px;
+}
+.exercise-mine-toggle--active {
+  border-color: var(--accent);
+  background: var(--accent-light);
+  color: var(--accent-dark);
+  font-weight: 600;
+}
 .exercise-filter-trigger {
   display: inline-flex;
   align-items: center;
@@ -3607,13 +3622,11 @@ a.analysis-split__nav-item {
   margin: 0 0 10px;
   font-size: 0.9rem;
   color: var(--danger);
-  grid-column: 1 / -1;
 }
 
 .dashboard-phase0-kpis__loading {
   font-size: 0.9rem;
-  margin: 0;
+  margin: 0 0 10px;
-  grid-column: 1 / -1;
 }
 
 .dashboard-kpi-card {
@@ -3685,6 +3698,55 @@ a.analysis-split__nav-item {
   margin-top: auto;
 }
 
+@media (max-width: 1023px) {
+  .dashboard-phase0-kpis {
+    display: flex;
+    flex-wrap: nowrap;
+    gap: 8px;
+    overflow-x: auto;
+    overflow-y: hidden;
+    -webkit-overflow-scrolling: touch;
+    scroll-snap-type: x proximity;
+    scrollbar-width: none;
+    padding: 2px 0 4px;
+    margin-left: calc(-1 * max(12px, env(safe-area-inset-left, 0px)));
+    margin-right: calc(-1 * max(12px, env(safe-area-inset-right, 0px)));
+    padding-left: max(12px, env(safe-area-inset-left, 0px));
+    padding-right: max(12px, env(safe-area-inset-right, 0px));
+  }
+  .dashboard-phase0-kpis::-webkit-scrollbar {
+    display: none;
+  }
+  .dashboard-kpi-card {
+    flex: 0 0 auto;
+    scroll-snap-align: start;
+    width: min(132px, 38vw);
+    min-height: 0;
+    padding: 10px 10px 8px;
+    gap: 2px;
+  }
+  .dashboard-kpi-card__icon {
+    width: 32px;
+    height: 32px;
+    margin-bottom: 0;
+  }
+  .dashboard-kpi-card__icon svg {
+    width: 18px;
+    height: 18px;
+  }
+  .dashboard-kpi-card__value {
+    font-size: 1.35rem;
+  }
+  .dashboard-kpi-card__label {
+    font-size: 0.72rem;
+    line-height: 1.25;
+  }
+  .dashboard-kpi-card__hint {
+    font-size: 0.6rem;
+    letter-spacing: 0.04em;
+  }
+}
+
 .dashboard-training-preview-grid {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));

frontend/src/pages/Dashboard.jsx

@@ -191,14 +191,16 @@ function Dashboard() {
                 </p>
               </div>
             </div>
-            <div className="dashboard-phase0-kpis">
             {phase0Err ? (
               <p className="dashboard-phase0-kpis__err" role="alert">
                 {phase0Err}
               </p>
             ) : null}
+            {!phase0Err && !phase0Stats ? (
+              <div className="dashboard-phase0-kpis__loading muted">Zahlen werden geladen…</div>
+            ) : null}
             {!phase0Err && phase0Stats ? (
-                <>
+              <div className="dashboard-phase0-kpis">
                 <Link className="dashboard-kpi-card" to={draftsHref}>
                   <span className="dashboard-kpi-card__icon" aria-hidden>
                     <FilePenLine size={22} strokeWidth={2} />
@@ -229,11 +231,8 @@ function Dashboard() {
                   <span className="dashboard-kpi-card__label">Gehalten {phase0Stats.year}</span>
                   <span className="dashboard-kpi-card__hint">abrechnungsnah</span>
                 </div>
-                </>
-              ) : !phase0Err ? (
-                <div className="dashboard-phase0-kpis__loading muted">Zahlen werden geladen…</div>
-              ) : null}
               </div>
+            ) : null}
           </section>
 
           <section className="dashboard-section" aria-labelledby="dash-trainings-title">

frontend/src/pages/ExercisesListPage.jsx

@@ -123,16 +123,29 @@ function levelOptionShort(levelStr) {
   return o ? String(o.level) : String(levelStr)
 }
 
-function exerciseListFiltersWithDashboardUrl(mergedFilters) {
+function applyDashboardExerciseListUrl(mergedFromPrefs) {
   try {
     const sp = new URLSearchParams(window.location.search)
-    if (sp.get('status') !== 'draft') return mergedFilters
+    const mine = sp.get('mine') === '1' || sp.get('created_by_me') === '1'
+    const statusDraft = sp.get('status') === 'draft'
+
+    if (mine) {
+      const next = { ...INITIAL_EXERCISE_LIST_FILTERS }
+      if (statusDraft) {
+        next.status_rules = [{ key: 'url-dashboard-draft', id: 'draft', mode: 'require' }]
+      }
+      return next
+    }
+
+    if (statusDraft) {
       return {
-      ...mergedFilters,
+        ...mergedFromPrefs,
         status_rules: [{ key: 'url-dashboard-draft', id: 'draft', mode: 'require' }],
       }
+    }
+    return mergedFromPrefs
   } catch {
-    return mergedFilters
+    return mergedFromPrefs
   }
 }
 
@@ -192,7 +205,7 @@ function ExercisesListPage() {
     if (!user?.id) return
     if (prefsAppliedRef.current) return
     const merged = mergeExerciseListPrefsFromApi(user.exercise_list_prefs)
-    setFilters(exerciseListFiltersWithDashboardUrl(merged))
+    setFilters(applyDashboardExerciseListUrl(merged))
     try {
       const sp = new URLSearchParams(window.location.search)
       if (sp.get('mine') === '1' || sp.get('created_by_me') === '1') setMineOnly(true)
@@ -270,6 +283,14 @@ function ExercisesListPage() {
   const filterChips = useMemo(() => {
     const chips = []
 
+    if (mineOnly) {
+      chips.push({
+        key: 'mine-only',
+        label: 'Nur von mir erstellt',
+        onRemove: () => setMineOnly(false),
+      })
+    }
+
     pushCatalogRuleFilterChips(chips, 'focus_rules', filters.focus_rules, focusOptions, 'Fokus', setFilters)
 
     if (filters.focus_only_without) {
@@ -410,6 +431,7 @@ function ExercisesListPage() {
 
     return chips
   }, [
+    mineOnly,
     filters,
     focusOptions,
     styleOptions,
@@ -625,7 +647,10 @@ function ExercisesListPage() {
     }
   }
 
-  const resetAllFilters = useCallback(() => setFilters({ ...INITIAL_EXERCISE_LIST_FILTERS }), [])
+  const resetAllFilters = useCallback(() => {
+    setMineOnly(false)
+    setFilters({ ...INITIAL_EXERCISE_LIST_FILTERS })
+  }, [])
 
   const handleSaveExerciseFilterPrefs = useCallback(async () => {
     const uid = user?.id
@@ -833,7 +858,16 @@ function ExercisesListPage() {
           list="exercise-search-titles"
           enterKeyHint="search"
         />
-        <div className="exercise-search-bar__actions">
+        <div className="exercise-search-bar__actions exercise-search-bar__actions--split">
+          <div className="exercise-search-bar__actions-main">
+            <button
+              type="button"
+              className={'btn btn-secondary exercise-mine-toggle' + (mineOnly ? ' exercise-mine-toggle--active' : '')}
+              onClick={() => setMineOnly((v) => !v)}
+              title="Nur Übungen, die mit deinem Profil als Ersteller gespeichert sind"
+            >
+              Meine Übungen
+            </button>
             <button type="button" className="btn btn-secondary exercise-filter-trigger" onClick={() => setFilterModalOpen(true)}>
               Filter
               {filterChips.length > 0 ? (
@@ -848,6 +882,7 @@ function ExercisesListPage() {
               </button>
             ) : null}
           </div>
+        </div>
         {filterChips.length > 0 ? (
           <div className="exercise-filter-chips-row" role="list" aria-label="Aktive Filter">
             {filterChips.map((c) => (