feat(falukant): add improve lover affection feature and localization updates

- Introduced the `improveLoverAffection` method in FalukantService to enhance relationship dynamics by allowing users to boost affection at a cost.
- Updated FalukantController and FalukantRouter to include the new endpoint for improving lover affection.
- Enhanced FamilyView component to provide a button for users to trigger the affection improvement action.
- Added localization entries for the new feature in multiple languages, ensuring clarity in user interactions regarding affection improvements.

frontend/src/views/falukant/FamilyView.vue

@@ -437,6 +437,13 @@
                             <button class="button button--secondary" @click="setLoverMaintenance(lover, 75)">
                                 {{ $t('falukant.family.lovers.actions.maintenanceHigh') }}
                             </button>
+                            <button
+                                class="button button--secondary"
+                                @click="improveLoverAffection(lover)"
+                                :title="$t('falukant.family.lovers.actions.improveAffectionHint', { cost: formatCost(loverAffectionActionCost) })"
+                            >
+                                {{ $t('falukant.family.lovers.actions.improveAffection', { cost: formatCost(loverAffectionActionCost) }) }}
+                            </button>
                             <button
                                 v-if="!lover.acknowledged"
                                 class="button button--secondary"
@@ -504,6 +511,7 @@ const MARRIAGE_GIFT_COSTS = {
     decent: 80,
     lavish: 180
 }
+const LOVER_AFFECTION_ACTION_COST = 60
 
 export default {
     name: 'FamilyView',
@@ -548,6 +556,9 @@ export default {
         marriageGiftCosts() {
             return MARRIAGE_GIFT_COSTS;
         },
+        loverAffectionActionCost() {
+            return LOVER_AFFECTION_ACTION_COST;
+        },
         partnerSummaryLine() {
             if (this.relationships?.length > 0) {
                 const r = this.relationships[0];
@@ -847,6 +858,25 @@ export default {
             }
         },
 
+        async improveLoverAffection(lover) {
+            try {
+                const { data } = await apiClient.post(`/api/falukant/family/lover/${lover.relationshipId}/improve-affection`);
+                await this.loadFamilyData();
+                showSuccess(
+                    this,
+                    this.$t('falukant.family.lovers.actions.improveAffectionSuccess', {
+                        cost: this.formatCost(data?.cost ?? this.loverAffectionActionCost),
+                        affection: data?.affection ?? '—',
+                        visibility: data?.visibility ?? '—',
+                        discretion: data?.discretion ?? '—',
+                    })
+                );
+            } catch (error) {
+                console.error('Error improving lover affection:', error);
+                showError(this, this.$t('falukant.family.lovers.actions.improveAffectionError'));
+            }
+        },
+
         async endLoverRelationship(lover) {
             const confirmed = await confirmAction(this, {
                 title: this.$t('falukant.family.lovers.actions.end'),