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/components/SlashCommandMenu.svelte

@@ -23,6 +23,9 @@
       >
         <span class="command-name">/{command.name}</span>
         <span class="command-description">{command.description}</span>
+        {#if command.source === "cli"}
+          <span class="cli-badge">CLI</span>
+        {/if}
       </button>
     {/each}
   </div>
@@ -82,5 +85,19 @@
   .command-description {
     color: var(--text-secondary);
     font-size: 13px;
+    flex: 1;
+  }
+
+  .cli-badge {
+    font-size: 10px;
+    font-weight: 600;
+    padding: 1px 5px;
+    border-radius: 4px;
+    background: color-mix(in srgb, var(--accent-primary) 15%, transparent);
+    color: var(--accent-primary);
+    border: 1px solid color-mix(in srgb, var(--accent-primary) 30%, transparent);
+    letter-spacing: 0.5px;
+    text-transform: uppercase;
+    flex-shrink: 0;
   }
 </style>