feat: Enable series name editing with duplicate validation

- Remove disabled state from series name input in edit modal
- Add duplicate name validation in SeriesController (resolves TODO)
- Update nameIgnorePrefix when series name changes
- Add frontend validation for duplicate series names
- Add updateSeriesName method to PATCH series immediately on rename
- Show backend error message in toast on failure
- Add i18n string for duplicate name error message

This enables users to rename existing series while preventing duplicate
series names within the same library.

client/components/modals/EditSeriesInputInnerModal.vue

@@ -8,7 +8,7 @@
         <div class="bg-bg rounded-lg px-2 py-6 sm:p-6 md:p-8" @click.stop>
           <div class="flex">
             <div class="grow p-1 min-w-48 sm:min-w-64 md:min-w-80">
-              <ui-input-dropdown ref="newSeriesSelect" v-model="selectedSeries.name" :items="existingSeriesNames" :disabled="!isNewSeries" :label="$strings.LabelSeriesName" @input="seriesNameInputHandler" />
+              <ui-input-dropdown ref="newSeriesSelect" v-model="selectedSeries.name" :items="existingSeriesNames" :label="$strings.LabelSeriesName" @input="seriesNameInputHandler" />
             </div>
             <div class="w-24 sm:w-28 md:w-40 p-1">
               <ui-text-input-with-label ref="sequenceInput" v-model="selectedSeries.sequence" :label="$strings.LabelSequence" />

client/components/widgets/SeriesInputWidget.vue

@@ -19,6 +19,7 @@ export default {
     return {
       selectedSeries: null,
       originalSeriesSequence: null,
+      originalSeriesName: null,
       showSeriesForm: false
     }
   },
@@ -61,6 +62,7 @@ export default {
       }
 
       this.originalSeriesSequence = _series.sequence
+      this.originalSeriesName = _series.name
       this.showSeriesForm = true
     },
     addNewSeries() {
@@ -71,6 +73,7 @@ export default {
       }
 
       this.originalSeriesSequence = null
+      this.originalSeriesName = null
       this.showSeriesForm = true
     },
     submitSeriesForm() {
@@ -81,6 +84,18 @@ export default {
 
       var existingSeriesIndex = this.seriesItems.findIndex((se) => se.id === this.selectedSeries.id)
 
+      // Check if renaming to a name that already exists in the library (different series)
+      var seriesSameName = this.series.find((se) => se.name.toLowerCase() === this.selectedSeries.name.toLowerCase())
+      if (seriesSameName && seriesSameName.id !== this.selectedSeries.id) {
+        // If editing an existing series and trying to rename to an existing name, block it
+        if (!this.selectedSeries.id.startsWith('new-')) {
+          this.$toast.error(this.$strings.ToastSeriesDuplicateName)
+          return
+        }
+        // For new series, use the existing series id instead
+        this.selectedSeries.id = seriesSameName.id
+      }
+
       var existingSeriesSameName = this.seriesItems.findIndex((se) => se.name.toLowerCase() === this.selectedSeries.name.toLowerCase())
       if (existingSeriesSameName >= 0 && existingSeriesIndex < 0) {
         console.error('Attempt to add duplicate series')
@@ -88,11 +103,6 @@ export default {
         return
       }
 
-      var seriesSameName = this.series.find((se) => se.name.toLowerCase() === this.selectedSeries.name.toLowerCase())
-      if (existingSeriesIndex < 0 && seriesSameName) {
-        this.selectedSeries.id = seriesSameName.id
-      }
-
       var selectedSeriesCopy = { ...this.selectedSeries }
       selectedSeriesCopy.displayName = selectedSeriesCopy.sequence ? `${selectedSeriesCopy.name} #${selectedSeriesCopy.sequence}` : selectedSeriesCopy.name
 
@@ -105,7 +115,25 @@ export default {
         this.seriesItems = seriesCopy
       }
 
+      // If this is an existing series (not new), update the series name immediately
+      if (!this.selectedSeries.id.startsWith('new-')) {
+        const hasNameChanged = this.originalSeriesName && this.selectedSeries.name !== this.originalSeriesName
+        if (hasNameChanged) {
+          this.updateSeriesName(this.selectedSeries.id, this.selectedSeries.name)
+        }
+      }
+
       this.showSeriesForm = false
+    },
+    async updateSeriesName(seriesId, name) {
+      try {
+        await this.$axios.$patch(`/api/series/${seriesId}`, { name })
+        this.$toast.success(this.$strings.ToastSeriesUpdateSuccess)
+      } catch (error) {
+        console.error('Failed to update series name:', error)
+        const errorMsg = error.response?.data || this.$strings.ToastSeriesUpdateFailed
+        this.$toast.error(errorMsg)
+      }
     }
   }
 }

client/strings/en-us.json

@@ -1127,6 +1127,7 @@
   "ToastSelectAtLeastOneUser": "Select at least one user",
   "ToastSendEbookToDeviceFailed": "Failed to send ebook to device",
   "ToastSendEbookToDeviceSuccess": "Ebook sent to device \"{0}\"",
+  "ToastSeriesDuplicateName": "A series with that name already exists in this library",
   "ToastSeriesSubmitFailedSameName": "Cannot add two series with the same name",
   "ToastSeriesUpdateFailed": "Series update failed",
   "ToastSeriesUpdateSuccess": "Series update success",