FEAT-NAMEGEN UC-1: 'Name vorschlagen'-Panel auf GerbilFormPage

- api/names.ts: suggestNames() + buildSuggestPath() + NAMEGEN_USAGES (norn/japa/mythg/ger/arb)
- de.ts: namegen-Sektion (button, panelTitle, letter/usages/load/states)
- NameSuggestPanel.tsx: inline-Panel mit Buchstabe/Herkunftskultur-Multiselect, Vorschlagsliste; 503 NamesKeyMissing → freundlicher Hinweis
- GerbilFormPage: 'Name vorschlagen'-Button neben Namensfeld (htmlFor-Pattern), Panel schließt+befüllt bei Auswahl
- vitest: 11 Tests (buildSuggestPath URL-Logik + NAMEGEN_USAGES-Struktur)
- e2e: mock /names/suggest + namesConfigured-Flag; 4 Specs (Panel öffnen, Klick befüllt, Buchstabe-Filter, 503-Fallback)

Gate: vitest 104/104, e2e 156/156, tsc clean

gerbil-manager-web/src/components/NameSuggestPanel.css

@@ -0,0 +1,114 @@
+.namegen-name-row {
+  display: flex;
+  gap: 0.5rem;
+  align-items: center;
+}
+
+.namegen-name-row .input {
+  flex: 1;
+  min-width: 0;
+}
+
+.namegen-panel {
+  border: 1px solid var(--color-border);
+  border-radius: 0.5rem;
+  padding: 1rem;
+  margin-bottom: 1rem;
+  background: var(--color-bg, #fff);
+}
+
+.namegen-panel__header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 0.75rem;
+  font-weight: 600;
+}
+
+.namegen-panel__filters {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 1rem;
+  align-items: flex-start;
+  margin-bottom: 0.75rem;
+}
+
+.namegen-panel__letter {
+  display: flex;
+  flex-direction: column;
+  gap: 0.25rem;
+}
+
+.namegen-panel__letter-input {
+  width: 5rem;
+}
+
+.namegen-panel__usages {
+  display: flex;
+  flex-direction: column;
+  gap: 0.25rem;
+}
+
+.namegen-usages-grid {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.4rem 1rem;
+}
+
+.namegen-usages-grid label {
+  display: flex;
+  align-items: center;
+  gap: 0.3rem;
+  font-size: 0.9rem;
+  cursor: pointer;
+}
+
+.namegen-suggestions {
+  list-style: none;
+  margin: 0.75rem 0 0;
+  padding: 0;
+  border-top: 1px solid var(--color-border);
+}
+
+.namegen-suggestion {
+  display: flex;
+  align-items: baseline;
+  gap: 0.5rem;
+  padding: 0.5rem 0;
+  border-bottom: 1px solid var(--color-border);
+  flex-wrap: wrap;
+}
+
+.namegen-suggestion:last-child {
+  border-bottom: none;
+}
+
+.namegen-suggestion__pick {
+  font-weight: 600;
+  color: var(--color-accent, #2563eb);
+  background: none;
+  border: none;
+  padding: 0;
+  cursor: pointer;
+  text-align: left;
+  font-size: inherit;
+  font-family: inherit;
+  min-width: 6rem;
+}
+
+.namegen-suggestion__pick:hover {
+  text-decoration: underline;
+}
+
+.namegen-suggestion__meaning {
+  flex: 1;
+  font-size: 0.88rem;
+  color: var(--color-text-muted);
+  min-width: 8rem;
+}
+
+.namegen-suggestion__origin {
+  font-size: 0.85rem;
+  color: var(--color-text-muted);
+  white-space: nowrap;
+}