Add adjustable context size, custom chatbot name, and cat icon for AI chat

Settings > AI tab now includes context size slider (2048–131072) with VRAM
estimate and a chatbot name field. ChatService reads both dynamically instead
of hardcoding num_ctx=16384 and "Purrse AI". Chat panel FAB and empty state
use mdi-cat icon to match the rest of the app.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/chat/ChatPanel.vue

@@ -8,14 +8,14 @@
     elevation="8"
     @click="togglePanel"
   >
-    <v-icon>{{ panelOpen ? 'mdi-close' : 'mdi-robot-outline' }}</v-icon>
+    <v-icon>{{ panelOpen ? 'mdi-close' : 'mdi-cat' }}</v-icon>
   </v-btn>
 
   <!-- Chat Panel -->
   <v-card v-show="panelOpen" class="chat-panel" elevation="12" rounded="lg">
     <!-- Header -->
     <v-toolbar density="compact" color="primary" class="flex-grow-0">
-      <v-toolbar-title class="text-body-1 font-weight-medium">Purrse AI</v-toolbar-title>
+      <v-toolbar-title class="text-body-1 font-weight-medium">{{ chatBotName }}</v-toolbar-title>
       <template v-slot:append>
         <v-menu>
           <template v-slot:activator="{ props }">
@@ -56,7 +56,7 @@
     <div ref="messagesContainer" class="chat-messages">
       <!-- Empty state -->
       <div v-if="messages.length === 0 && !loading" class="d-flex flex-column align-center justify-center" style="height: 100%;">
-        <v-icon size="48" color="primary" class="mb-3">mdi-robot-outline</v-icon>
+        <v-icon size="48" color="primary" class="mb-3">mdi-cat</v-icon>
         <p class="text-body-2 text-medium-emphasis mb-4">Ask me about your finances</p>
         <div class="d-flex flex-wrap justify-center ga-2 px-4">
           <v-chip
@@ -140,6 +140,7 @@
 import { ref, nextTick, onMounted, watch } from 'vue'
 import { useRoute } from 'vue-router'
 import { chatApi } from '@/services/chat'
+import { aiCategorizationApi } from '@/services/aiCategorization'
 import { usePageContext } from '@/composables/usePageContext'
 import ChatToolResult from '@/views/chat/ChatToolResult.vue'
 import type { ChatConversation, ChatMessage } from '@/types'
@@ -155,6 +156,7 @@ const inputMessage = ref('')
 const loading = ref(false)
 const messagesContainer = ref<HTMLElement | null>(null)
 const conversationsLoaded = ref(false)
+const chatBotName = ref('Purrse AI')
 
 let _idCounter = 0
 function tempId(): string {
@@ -214,6 +216,18 @@ function togglePanel() {
   panelOpen.value = !panelOpen.value
   if (panelOpen.value && !conversationsLoaded.value) {
     loadConversations()
+    loadChatBotName()
+  }
+}
+
+async function loadChatBotName() {
+  try {
+    const { data } = await aiCategorizationApi.getSettings()
+    if (data.chatBotName) {
+      chatBotName.value = data.chatBotName
+    }
+  } catch {
+    // Default name is fine
   }
 }
 

frontend/src/types/index.ts

@@ -521,6 +521,8 @@ export interface AiCategorizationSettings {
   updatePayeeDefaults: boolean
   systemPrompt: string | null
   userPromptTemplate: string | null
+  chatContextSize: number
+  chatBotName: string | null
 }
 
 export interface OllamaConnectionTestResult {

frontend/src/views/settings/SettingsView.vue

@@ -762,6 +762,37 @@
           </v-card-text>
         </v-card>
 
+        <v-card class="mt-4">
+          <v-card-title>AI Chat Settings</v-card-title>
+          <v-card-text>
+            <div class="text-body-2 mb-1">Context Size: {{ aiSettings.chatContextSize.toLocaleString() }} tokens</div>
+            <v-slider
+              v-model="aiSettings.chatContextSize"
+              :min="2048"
+              :max="131072"
+              :step="2048"
+              thumb-label
+              color="primary"
+              hide-details
+              class="mb-1"
+            />
+            <div class="text-caption text-medium-emphasis mb-4">
+              Estimated VRAM: ~{{ Math.round((aiSettings.chatContextSize / 1024) * 75) }} MB — Increase if the AI loses context in long chats. Decrease if Ollama runs out of memory.
+            </div>
+
+            <v-text-field
+              v-model="aiSettings.chatBotName"
+              label="Chatbot Name"
+              variant="outlined"
+              density="compact"
+              placeholder="Purrse AI"
+              hint="Custom name shown in the chat panel header and used by the AI"
+              persistent-hint
+              clearable
+            />
+          </v-card-text>
+        </v-card>
+
         <v-snackbar v-model="showAiSuccess" :timeout="4000" color="success">
           AI categorization settings saved
         </v-snackbar>
@@ -1305,7 +1336,9 @@ const aiSettings = reactive<AiCategorizationSettings>({
   timeoutSeconds: 30,
   updatePayeeDefaults: true,
   systemPrompt: null,
-  userPromptTemplate: null
+  userPromptTemplate: null,
+  chatContextSize: 16384,
+  chatBotName: null
 })
 const aiSaving = ref(false)
 const aiTesting = ref(false)

src/Purrse.Api/Services/AiCategorizationService.cs

@@ -67,13 +67,14 @@ public class AiCategorizationService : IAiCategorizationService
         if (settings == null)
         {
             return new AiCategorizationSettingsResponse(
-                false, "http://localhost:11434", "llama3.1:8b", 0.7, 30, true, null, null);
+                false, "http://localhost:11434", "llama3.1:8b", 0.7, 30, true, null, null, 16384, null);
         }
 
         return new AiCategorizationSettingsResponse(
             settings.IsEnabled, settings.OllamaUrl, settings.ModelName,
             settings.ConfidenceThreshold, settings.TimeoutSeconds, settings.UpdatePayeeDefaults,
-            settings.SystemPrompt, settings.UserPromptTemplate);
+            settings.SystemPrompt, settings.UserPromptTemplate,
+            settings.ChatContextSize, settings.ChatBotName);
     }
 
     public async Task<AiCategorizationSettingsResponse> UpdateSettingsAsync(Guid userId, UpdateAiCategorizationSettingsRequest request)
@@ -98,6 +99,8 @@ public class AiCategorizationService : IAiCategorizationService
         settings.UpdatePayeeDefaults = request.UpdatePayeeDefaults;
         settings.SystemPrompt = string.IsNullOrWhiteSpace(request.SystemPrompt) ? null : request.SystemPrompt;
         settings.UserPromptTemplate = string.IsNullOrWhiteSpace(request.UserPromptTemplate) ? null : request.UserPromptTemplate;
+        settings.ChatContextSize = request.ChatContextSize;
+        settings.ChatBotName = string.IsNullOrWhiteSpace(request.ChatBotName) ? null : request.ChatBotName;
         settings.UpdatedAt = DateTime.UtcNow;
 
         await _db.SaveChangesAsync();
@@ -105,7 +108,8 @@ public class AiCategorizationService : IAiCategorizationService
         return new AiCategorizationSettingsResponse(
             settings.IsEnabled, settings.OllamaUrl, settings.ModelName,
             settings.ConfidenceThreshold, settings.TimeoutSeconds, settings.UpdatePayeeDefaults,
-            settings.SystemPrompt, settings.UserPromptTemplate);
+            settings.SystemPrompt, settings.UserPromptTemplate,
+            settings.ChatContextSize, settings.ChatBotName);
     }
 
     public async Task<OllamaConnectionTestResponse> TestConnectionAsync(Guid userId)

src/Purrse.Api/Services/ChatService.cs

@@ -113,6 +113,8 @@ public class ChatService : IChatService
         var settings = await _db.AiCategorizationSettings.FirstOrDefaultAsync(s => s.UserId == userId);
         var ollamaUrl = settings?.OllamaUrl ?? "http://localhost:11434";
         var modelName = settings?.ModelName ?? "llama3.1:8b";
+        var chatContextSize = settings?.ChatContextSize ?? 16384;
+        var chatBotName = settings?.ChatBotName;
 
         // Save user message
         var userMessage = new ChatMessage
@@ -130,10 +132,15 @@ public class ChatService : IChatService
         var ollamaMessages = new List<OllamaToolMessage>();
 
         // System prompt
+        var systemPrompt = string.Format(SystemPromptTemplate, DateTime.UtcNow.ToString("yyyy-MM-dd"));
+        if (!string.IsNullOrWhiteSpace(chatBotName))
+        {
+            systemPrompt += $"\nYour name is {chatBotName}.";
+        }
         ollamaMessages.Add(new OllamaToolMessage
         {
             Role = "system",
-            Content = string.Format(SystemPromptTemplate, DateTime.UtcNow.ToString("yyyy-MM-dd"))
+            Content = systemPrompt
         });
 
         // Last 20 conversation messages
@@ -199,7 +206,7 @@ public class ChatService : IChatService
                 Messages = ollamaMessages,
                 Stream = false,
                 Tools = tools,
-                Options = new OllamaRequestOptions { NumCtx = 16384 }
+                Options = new OllamaRequestOptions { NumCtx = chatContextSize }
             };
 
             var response = await CallOllamaAsync(ollamaUrl, ollamaRequest);
@@ -272,7 +279,7 @@ public class ChatService : IChatService
                         Messages = ollamaMessages,
                         Stream = false,
                         Tools = null, // drop tools so the model focuses on the page data
-                        Options = new OllamaRequestOptions { NumCtx = 16384 }
+                        Options = new OllamaRequestOptions { NumCtx = chatContextSize }
                     };
                     var retryResponse = await CallOllamaAsync(ollamaUrl, retryRequest);
                     rawContent = retryResponse?.Message?.Content;

src/Purrse.Core/DTOs/AiCategorizationDtos.cs

@@ -11,7 +11,9 @@ public record AiCategorizationSettingsResponse(
     int TimeoutSeconds,
     bool UpdatePayeeDefaults,
     string? SystemPrompt,
-    string? UserPromptTemplate);
+    string? UserPromptTemplate,
+    int ChatContextSize,
+    string? ChatBotName);
 
 public record UpdateAiCategorizationSettingsRequest(
     bool IsEnabled,
@@ -21,7 +23,9 @@ public record UpdateAiCategorizationSettingsRequest(
     int TimeoutSeconds,
     bool UpdatePayeeDefaults,
     string? SystemPrompt,
-    string? UserPromptTemplate);
+    string? UserPromptTemplate,
+    int ChatContextSize,
+    string? ChatBotName);
 
 // Connection test
 public record OllamaConnectionTestResponse(

src/Purrse.Core/Models/AiCategorizationSettings.cs

@@ -12,6 +12,8 @@ public class AiCategorizationSettings
     public bool UpdatePayeeDefaults { get; set; } = true;
     public string? SystemPrompt { get; set; }
     public string? UserPromptTemplate { get; set; }
+    public int ChatContextSize { get; set; } = 16384;
+    public string? ChatBotName { get; set; }
     public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
 
     public User User { get; set; } = null!;

src/Purrse.Data/Configurations/AiCategorizationSettingsConfiguration.cs

@@ -14,6 +14,7 @@ public class AiCategorizationSettingsConfiguration : IEntityTypeConfiguration<Ai
         builder.Property(s => s.ModelName).HasMaxLength(100);
         builder.Property(s => s.SystemPrompt).HasMaxLength(4000);
         builder.Property(s => s.UserPromptTemplate).HasMaxLength(4000);
+        builder.Property(s => s.ChatBotName).HasMaxLength(100);
 
         builder.HasOne(s => s.User)
             .WithOne(u => u.AiCategorizationSettings)

src/Purrse.Data/Migrations/20260213192005_AddChatSettings.cs

@@ -0,0 +1,40 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Purrse.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddChatSettings : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "ChatBotName",
+                table: "ai_categorization_settings",
+                type: "character varying(100)",
+                maxLength: 100,
+                nullable: true);
+
+            migrationBuilder.AddColumn<int>(
+                name: "ChatContextSize",
+                table: "ai_categorization_settings",
+                type: "integer",
+                nullable: false,
+                defaultValue: 0);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "ChatBotName",
+                table: "ai_categorization_settings");
+
+            migrationBuilder.DropColumn(
+                name: "ChatContextSize",
+                table: "ai_categorization_settings");
+        }
+    }
+}

src/Purrse.Data/Migrations/PurrseDbContextModelSnapshot.cs

@@ -91,6 +91,13 @@ namespace Purrse.Data.Migrations
                         .ValueGeneratedOnAdd()
                         .HasColumnType("uuid");
 
+                    b.Property<string>("ChatBotName")
+                        .HasMaxLength(100)
+                        .HasColumnType("character varying(100)");
+
+                    b.Property<int>("ChatContextSize")
+                        .HasColumnType("integer");
+
                     b.Property<double>("ConfidenceThreshold")
                         .HasColumnType("double precision");