feat: CLI v2.1.68–v2.1.74 compatibility updates (#221)

## Summary

This PR brings Hikari Desktop up to full compatibility with Claude Code CLI versions v2.1.68 through v2.1.74, implementing all changelog items audited in issues #200–#218.

## Changes

### Bug Fixes
- Remove deprecated Claude Opus 4.0 and 4.1 models from the model selector
- Auto-migrate users pinned to deprecated models to Opus 4.6

### New Features
- Add cron tool support (`CronCreate`, `CronDelete`, `CronList`) with character state mapping and `CLAUDE_CODE_DISABLE_CRON` settings toggle
- Handle `EnterWorktree` and `ExitWorktree` tools in character state mapping and tool display
- Add CLI update check with npm registry indicator in the version bar
- Add `agent_type` field and support the Agent tool rename from CLI v2.1.69
- Consume `worktree` field from status line hook events
- Display per-agent model override in the agent monitor tree
- Expose Claude Code CLI built-in slash commands (`/simplify`, `/loop`, `/batch`, `/memory`, `/context`) in the command menu with CLI badges
- Add `includeGitInstructions` toggle in settings
- Add `ENABLE_CLAUDEAI_MCP_SERVERS` opt-out setting
- Linkify MCP binary file paths (PDFs, audio, Office docs) in markdown output
- Add auto-memory panel, `/memory` slash command shortcut, and unified toast notification system
- Toast notifications for `WorktreeCreate` and `WorktreeRemove` hook events
- Sort session resume list by most recent activity, with most recent user message as preview
- Convert WSL Linux paths to Windows UNC paths when opening binary files via `open_binary_file` command
- Expose `autoMemoryDirectory` setting in ConfigSidebar (Agent Settings section)
- Add `/context` as a CLI built-in in the slash command menu
- Expose `modelOverrides` setting as a JSON textarea in ConfigSidebar (for AWS Bedrock, Google Vertex, etc.)

> **Note:** The CLI update check commit does not have a corresponding issue — it was a bonus addition during the audit sprint.

## Closes

Closes #200
Closes #201
Closes #202
Closes #205
Closes #206
Closes #207
Closes #208
Closes #209
Closes #210
Closes #211
Closes #212
Closes #213
Closes #214
Closes #215
Closes #216
Closes #217
Closes #218

Reviewed-on: #221
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

src/routes/+page.svelte

@@ -37,11 +37,11 @@
   import PermissionModal from "$lib/components/PermissionModal.svelte";
   import UserQuestionModal from "$lib/components/UserQuestionModal.svelte";
   import ConfigSidebar from "$lib/components/ConfigSidebar.svelte";
-  import AchievementNotification from "$lib/components/AchievementNotification.svelte";
   import AchievementsPanel from "$lib/components/AchievementsPanel.svelte";
-  import UpdateNotification from "$lib/components/UpdateNotification.svelte";
+  import ToastContainer from "$lib/components/ToastContainer.svelte";
   import CloseAppConfirmModal from "$lib/components/CloseAppConfirmModal.svelte";
-  import MemoryBrowserPanel from "$lib/components/MemoryBrowserPanel.svelte";
+  import type { UpdateInfo } from "$lib/types/messages";
+  import { toastStore } from "$lib/stores/toasts";
   import { debugConsoleStore } from "$lib/stores/debugConsole";
   import { initializeTodoListener, cleanupTodoListener } from "$lib/stores/todos";
 
@@ -85,7 +85,6 @@
   }
 
   let initialized = false;
-  let updateNotification: UpdateNotification | undefined = $state(undefined);
   let achievementPanelOpen = $state(false);
   let currentCharacterState: CharacterState = $state("idle");
   let compactModeActive = $state(false);
@@ -336,6 +335,19 @@
     }
   }
 
+  async function checkForUpdates() {
+    const config = configStore.getConfig();
+    if (!config.update_checks_enabled) return;
+    try {
+      const info = await invoke<UpdateInfo>("check_for_updates");
+      if (info.has_update) {
+        toastStore.addUpdate(info.latest_version, info.current_version, info.release_url);
+      }
+    } catch (err) {
+      console.error("Failed to check for updates:", err);
+    }
+  }
+
   async function handleInterrupt() {
     try {
       const conversationId = get(claudeStore.activeConversationId);
@@ -483,9 +495,7 @@
       window.addEventListener("keydown", handleGlobalKeydown);
 
       // Check for updates on startup
-      if (config.update_checks_enabled) {
-        updateNotification?.checkForUpdates();
-      }
+      await checkForUpdates();
 
       // Apply compact mode if saved (resize window)
       if (config.compact_mode) {
@@ -584,13 +594,11 @@
     <PermissionModal />
     <UserQuestionModal />
     <ConfigSidebar />
-    <MemoryBrowserPanel />
-    <AchievementNotification />
     <AchievementsPanel
       bind:isOpen={achievementPanelOpen}
       onClose={() => (achievementPanelOpen = false)}
     />
-    <UpdateNotification bind:this={updateNotification} />
+    <ToastContainer />
     <CloseAppConfirmModal
       isOpen={closeConfirmModalOpen}
       {hasActiveConversation}