feat(stellungnahme): Tag-Pill-Filter, flache Gruppen, Sticky-Footer, Auto-Save, Auto-Focus

Filter:
- Tag-Pill-Reihe in Step 2 oberhalb der Suche. Multi-Select, OR-Logik
  zwischen Pills, AND mit Text-Suche. Pills aus allen Nicht-Fetch-Tags
  der deduplizierten Fragmente, alphabetisch sortiert. "Filter
  zurücksetzen" erscheint bei ≥1 aktivem Pill. Empty-State erklärt
  was nicht matcht (Text/Pills/beides).

Akkordeons raus (Variante B):
- Gruppen-Header bleiben als sichtbare Trenner (Label + Anzahl + "Alle"-
  Toggle), aber Click-to-Expand-Mechanik weg — Items immer offen.
  expandedGroups + toggleGroup als dead code entfernt.

Bedienkomfort:
- Sticky Mobile-Footer für alle 5 Step-Nav-Rows: bottom-2 mit
  weißem BG + Shadow + Backdrop-Blur. Auf Desktop unverändert (sm:static).
- Auto-Save-Indikator "✓ Gespeichert" rechts oben, blitzt 2s nach
  jeder Mutation. Pure UI — wir speichern eh schon in localStorage.
- Auto-Focus per Svelte-Action beim Step-Wechsel: Step 2 → Such-Input,
  Step 3 → Betroffenheit-Textarea, Step 4 → Name-Input.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/lib/iconify-mdi-subset.generated.json

@@ -123,6 +123,24 @@
     "content-save-outline": {
       "body": "<path fill=\"currentColor\" d=\"M17 3H5a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14c1.1 0 2-.9 2-2V7zm2 16H5V5h11.17L19 7.83zm-7-7c-1.66 0-3 1.34-3 3s1.34 3 3 3s3-1.34 3-3s-1.34-3-3-3M6 6h9v4H6z\"/>"
     },
+    "home-group": {
+      "body": "<path fill=\"currentColor\" d=\"M17 16h-2v6h-3v-5H8v5H5v-6H3l7-6zM6 2l4 4H9v3H7V6H5v3H3V6H2zm12 1l5 5h-1v4h-3V9h-2v3h-1.66L14 10.87V8h-1z\"/>"
+    },
+    "vector-square": {
+      "body": "<path fill=\"currentColor\" d=\"M2 2h6v2h8V2h6v6h-2v8h2v6h-6v-2H8v2H2v-6h2V8H2zm14 6V6H8v2H6v8h2v2h8v-2h2V8zM4 4v2h2V4zm14 0v2h2V4zM4 18v2h2v-2zm14 0v2h2v-2z\"/>"
+    },
+    "wind-turbine": {
+      "body": "<path fill=\"currentColor\" d=\"m13.33 11.67l2.88 2.91c1.41-1.42 0-2.83 0-2.83l-1.49-1.51c.18-.38.28-.8.28-1.24c0-1.05-.54-1.97-1.36-2.5L15 2.11c-1.91-.58-2.5 1.33-2.5 1.33l-.81 2.59c-1.23.13-2.23.97-2.56 2.15L4.67 9.63c.64 1.9 2.53 1.27 2.53 1.27l2.07-.67c.34.74.96 1.31 1.73 1.59V19s-2 0-2 2v1h6v-1s0-2-2-2v-7.18c.12-.04.23-.1.33-.15M10.5 9A1.5 1.5 0 0 1 12 7.5A1.5 1.5 0 0 1 13.5 9a1.5 1.5 0 0 1-1.5 1.5A1.5 1.5 0 0 1 10.5 9\"/>"
+    },
+    "arrow-expand-vertical": {
+      "body": "<path fill=\"currentColor\" d=\"M13 9v6h3l-4 4l-4-4h3V9H8l4-4l4 4zM4 2h16v2H4zm0 18h16v2H4z\"/>"
+    },
+    "domain": {
+      "body": "<path fill=\"currentColor\" d=\"M18 15h-2v2h2m0-6h-2v2h2m2 6h-8v-2h2v-2h-2v-2h2v-2h-2V9h8M10 7H8V5h2m0 6H8V9h2m0 6H8v-2h2m0 6H8v-2h2M6 7H4V5h2m0 6H4V9h2m0 6H4v-2h2m0 6H4v-2h2m6-10V3H2v18h20V7z\"/>"
+    },
+    "flag-outline": {
+      "body": "<path fill=\"currentColor\" d=\"m12.36 6l.4 2H18v6h-3.36l-.4-2H7V6zM14 4H5v17h2v-7h5.6l.4 2h7V6h-5.6\"/>"
+    },
     "transmission-tower": {
       "body": "<path fill=\"currentColor\" d=\"m8.28 5.45l-1.78-.9L7.76 2h8.47l1.27 2.55l-1.78.89L15 4H9zM18.62 8h-4.53l-.79-3h-2.6l-.79 3H5.38L4.1 10.55l1.79.89l.73-1.44h10.76l.72 1.45l1.79-.89zm-.85 14H15.7l-.24-.9L12 15.9l-3.47 5.2l-.23.9H6.23l2.89-11h2.07l-.36 1.35L12 14.1l1.16-1.75l-.35-1.35h2.07zm-6.37-7l-.9-1.35l-1.18 4.48zm3.28 3.12l-1.18-4.48l-.9 1.36z\"/>"
     },
@@ -220,9 +238,6 @@
     "tag-outline": {
       "body": "<path fill=\"currentColor\" d=\"m21.41 11.58l-9-9A2 2 0 0 0 11 2H4a2 2 0 0 0-2 2v7a2 2 0 0 0 .59 1.42l9 9A2 2 0 0 0 13 22a2 2 0 0 0 1.41-.59l7-7A2 2 0 0 0 22 13a2 2 0 0 0-.59-1.42M13 20l-9-9V4h7l9 9M6.5 5A1.5 1.5 0 1 1 5 6.5A1.5 1.5 0 0 1 6.5 5\"/>"
     },
-    "flag-outline": {
-      "body": "<path fill=\"currentColor\" d=\"m12.36 6l.4 2H18v6h-3.36l-.4-2H7V6zM14 4H5v17h2v-7h5.6l.4 2h7V6h-5.6\"/>"
-    },
     "information-outline": {
       "body": "<path fill=\"currentColor\" d=\"M11 9h2V7h-2m1 13c-4.41 0-8-3.59-8-8s3.59-8 8-8s8 3.59 8 8s-3.59 8-8 8m0-18A10 10 0 0 0 2 12a10 10 0 0 0 10 10a10 10 0 0 0 10-10A10 10 0 0 0 12 2m-1 15h2v-6h-2z\"/>"
     }