fix: font resize live-update + chat message persistence

- Font size slider now calls saveSettings() instead of saveData()
  so changes propagate to open views immediately
- Chat messages persist across plugin reload via chatMessages
  array in plugin settings — ChatPersistence interface bridges
  ChatView to Plugin data layer
- Messages auto-save on append and on close

src/chat-view.ts

@@ -16,11 +16,18 @@ export interface ApiClient {
   ): Promise<ChatCompletionResponse>;
 }
 
+/** Persistence interface — saves/loads chat messages via plugin data. */
+export interface ChatPersistence {
+  loadMessages(): Message[];
+  saveMessages(messages: Message[]): Promise<void>;
+}
+
 export const VIEW_TYPE = "hermes-chat-view";
 
 export class ChatView extends ItemView {
   private apiClient: ApiClient | null = null;
   private contextBridge: ContextBridge | null = null;
+  private persistence: ChatPersistence | null = null;
   private chatState: ChatState;
   private messagesContainer: HTMLElement | null = null;
   private statusBar: HTMLElement | null = null;
@@ -43,10 +50,11 @@ export class ChatView extends ItemView {
   private suggestIndex: number = -1;
   private filteredCommands: SlashCommand[] = [];
 
-  constructor(leaf: WorkspaceLeaf, apiClient?: ApiClient, contextBridge?: ContextBridge) {
+  constructor(leaf: WorkspaceLeaf, apiClient?: ApiClient, contextBridge?: ContextBridge, persistence?: ChatPersistence) {
     super(leaf);
     this.apiClient = apiClient ?? null;
     this.contextBridge = contextBridge ?? null;
+    this.persistence = persistence ?? null;
     this.chatState = {
       sessionId: null,
       messages: [],
@@ -167,10 +175,20 @@ export class ChatView extends ItemView {
     // --- Status bar ---
     this.statusBar = container.createDiv("chat-status-bar");
     this.updateStatus(this.chatState.model, null);
+
+    // Restore saved messages from previous session
+    if (this.persistence) {
+      const saved = this.persistence.loadMessages();
+      if (saved.length > 0) {
+        for (const msg of saved) {
+          await this.appendMessage(msg.role, msg.content);
+        }
+      }
+    }
   }
 
   async onClose(): Promise<void> {
-    // No persistent cleanup needed
+    await this.persistence?.saveMessages(this.chatState.messages);
   }
 
   // ---------------------------------------------------------------------------
@@ -201,6 +219,17 @@ export class ChatView extends ItemView {
   async appendMessage(role: "user" | "assistant" | "system", content: string): Promise<void> {
     if (!this.messagesContainer) return;
 
+    // Track in state for persistence
+    const msg: Message = {
+      id: `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
+      role,
+      content,
+      timestamp: Date.now(),
+    };
+    this.chatState.messages.push(msg);
+    // Fire-and-forget save — don't block rendering
+    this.persistence?.saveMessages(this.chatState.messages);
+
     const wrapper = this.messagesContainer.createDiv("chat-message");
     wrapper.addClass(`chat-message-${role}`);
 
@@ -472,6 +501,16 @@ export class ChatView extends ItemView {
         await MarkdownRenderer.render(this.app, fullContent, contentDiv, "", this);
       }
 
+      // Track assistant response in state for persistence
+      const assistantMsg: Message = {
+        id: `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
+        role: "assistant",
+        content: fullContent,
+        timestamp: Date.now(),
+      };
+      this.chatState.messages.push(assistantMsg);
+      this.persistence?.saveMessages(this.chatState.messages);
+
       if (response.sessionId) {
         this.chatState.sessionId = response.sessionId;
         this.updateStatus(response.model, response.sessionId);

src/main.ts

@@ -1,6 +1,6 @@
 import { Plugin, WorkspaceLeaf } from "obsidian";
 import { HermesChatSettingTab, HermesChatSettings, DEFAULT_SETTINGS, BUILTIN_COMMANDS } from "./settings";
-import { ChatView, VIEW_TYPE } from "./chat-view";
+import { ChatView, VIEW_TYPE, ChatPersistence } from "./chat-view";
 import { ApiClient } from "./api-client";
 import { ContextBridge } from "./context-bridge";
 import type { GatewayConfig, SlashCommand } from "./types";
@@ -19,7 +19,14 @@ export default class HermesChatPlugin extends Plugin {
       VIEW_TYPE,
       (leaf: WorkspaceLeaf) => {
         const client = new ApiClient(this.getGatewayConfig());
-        const view = new ChatView(leaf, client, this.contextBridge!);
+        const persistence: ChatPersistence = {
+          loadMessages: () => this.settings.chatMessages,
+          saveMessages: async (messages) => {
+            this.settings.chatMessages = messages;
+            await this.saveData(this.settings);
+          },
+        };
+        const view = new ChatView(leaf, client, this.contextBridge!, persistence);
         view.setContextActive(this.settings.enableContextInjection);
         view.setSlashCommands(this.getAllCommands());
         view.setChatFontSize(this.settings.chatFontSize);

src/settings.ts

@@ -1,6 +1,8 @@
 import { App, PluginSettingTab, Setting } from "obsidian";
 import type HermesChatPlugin from "./main";
 
+import type { Message } from "./types";
+
 export interface HermesChatSettings {
   gatewayUrl: string;
   apiKey: string;
@@ -8,6 +10,7 @@ export interface HermesChatSettings {
   enableContextInjection: boolean;
   chatFontSize: number;
   customCommands: { trigger: string; description: string; prompt: string }[];
+  chatMessages: Message[];
 }
 
 /** Built-in slash commands shipped with the plugin. */
@@ -36,6 +39,7 @@ export const DEFAULT_SETTINGS: HermesChatSettings = {
   enableContextInjection: true,
   chatFontSize: 14,
   customCommands: [],
+  chatMessages: [],
 };
 
 export class HermesChatSettingTab extends PluginSettingTab {
@@ -113,7 +117,7 @@ export class HermesChatSettingTab extends PluginSettingTab {
           .setDynamicTooltip()
           .onChange(async (value) => {
             this.plugin.settings.chatFontSize = value;
-            await this.plugin.saveData(this.plugin.settings);
+            await this.plugin.saveSettings();
           })
       );