Add error handling for nobility advancement in NobilityView: Implemented specific error messages for cooldown and unmet requirements, enhancing user feedback during advancement attempts.

frontend/src/i18n/locales/de/falukant.json

@@ -738,7 +738,12 @@
             "advance": {
                 "confirm": "Aufsteigen beantragen"
             },
-            "cooldown": "Du kannst frühestens wieder am {date} aufsteigen."
+            "cooldown": "Du kannst frühestens wieder am {date} aufsteigen.",
+            "errors": {
+                "tooSoon": "Aufstieg zu früh.",
+                "unmet": "Folgende Voraussetzungen fehlen:",
+                "generic": "Der Aufstieg ist fehlgeschlagen."
+            }
         },
         "reputation": {
             "title": "Reputation",

frontend/src/i18n/locales/en/falukant.json

@@ -196,7 +196,12 @@
             }
         },
         "nobility": {
-            "cooldown": "You can only advance again on {date}."
+            "cooldown": "You can only advance again on {date}.",
+            "errors": {
+                "tooSoon": "Advancement too soon.",
+                "unmet": "The following requirements are not met:",
+                "generic": "Advancement failed."
+            }
     },
         "branchProduction": {
             "storageAvailable": "Free storage"

frontend/src/views/falukant/NobilityView.vue

@@ -124,6 +124,29 @@
           await this.loadNobility();
         } catch (err) {
           console.error('Error advancing nobility:', err);
+          const resp = err?.response;
+          if (resp?.status === 412) {
+            if (resp.data?.message === 'nobilityTooSoon') {
+              const retryAtIso = resp.data?.retryAt;
+              const retryStr = retryAtIso ? this.formatDate(retryAtIso) : '';
+              const msg = this.$t('falukant.nobility.errors.tooSoon');
+              this.$root.$refs.errorDialog?.open(retryStr ? `${msg} — ${this.$t('falukant.nobility.cooldown', { date: retryStr })}` : msg);
+            } else if (resp.data?.message === 'nobilityRequirements') {
+              const unmet = resp.data?.unmet || [];
+              const items = unmet.map(u => {
+                if (u.type === 'money') return this.$t('falukant.nobility.requirement.money', { amount: this.formatCost(u.required) });
+                if (u.type === 'cost') return this.$t('falukant.nobility.requirement.cost', { amount: this.formatCost(u.required) });
+                if (u.type === 'branches') return this.$t('falukant.nobility.requirement.branches', { amount: u.required });
+                return `${u.type}: ${u.required}`;
+              }).join('\n');
+              const base = this.$t('falukant.nobility.errors.unmet');
+              this.$root.$refs.errorDialog?.open(`${base}\n${items}`);
+            } else {
+              this.$root.$refs.errorDialog?.open('tr:falukant.nobility.errors.generic');
+            }
+          } else {
+            this.$root.$refs.errorDialog?.open('tr:falukant.nobility.errors.generic');
+          }
         } finally {
           this.isAdvancing = false;
         }