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/lib/stores/sessions.ts

@@ -378,7 +378,11 @@ function createSessionsStore() {
     isLoading.set(true);
     try {
       const result = await invoke<SessionListItem[]>("list_sessions");
-      sessions.set(result);
+      sessions.set(
+        result.sort(
+          (a, b) => new Date(b.last_activity_at).getTime() - new Date(a.last_activity_at).getTime()
+        )
+      );
     } catch (error) {
       console.error("Failed to load sessions:", error);
     } finally {
@@ -395,15 +399,13 @@ function createSessionsStore() {
       tool_name: line.toolName,
     }));
 
-    const userAndAssistantMessages = conversation.terminalLines.filter(
-      (line) => line.type === "user" || line.type === "assistant"
-    );
-    const previewContent =
-      userAndAssistantMessages
-        .slice(0, 3)
-        .map((m) => m.content)
-        .join(" ")
-        .slice(0, 150) + (userAndAssistantMessages.length > 3 ? "..." : "");
+    const userMessages = conversation.terminalLines.filter((line) => line.type === "user");
+    const mostRecentUserMessage = userMessages.at(-1);
+    const previewContent = mostRecentUserMessage
+      ? mostRecentUserMessage.content.length > 150
+        ? mostRecentUserMessage.content.slice(0, 150) + "..."
+        : mostRecentUserMessage.content
+      : "Empty conversation";
 
     const session: SavedSession = {
       id: conversation.id,
@@ -458,7 +460,11 @@ function createSessionsStore() {
       const result = await invoke<SessionListItem[]>("search_sessions", {
         query,
       });
-      sessions.set(result);
+      sessions.set(
+        result.sort(
+          (a, b) => new Date(b.last_activity_at).getTime() - new Date(a.last_activity_at).getTime()
+        )
+      );
     } catch (error) {
       console.error("Failed to search sessions:", error);
     } finally {