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/Markdown.svelte

@@ -3,7 +3,9 @@
   import hljs from "highlight.js";
   import { onMount } from "svelte";
   import { openUrl } from "@tauri-apps/plugin-opener";
+  import { invoke } from "@tauri-apps/api/core";
   import { clipboardStore } from "$lib/stores/clipboard";
+  import { linkifyFilePaths } from "$lib/utils/filePaths";
 
   interface Props {
     content: string;
@@ -113,7 +115,8 @@
   let parsedHtml = $derived.by(() => {
     try {
       const html = marked.parse(content) as string;
-      return processSpoilers(html);
+      const withSpoilers = processSpoilers(html);
+      return linkifyFilePaths(withSpoilers);
     } catch {
       return content;
     }
@@ -140,9 +143,18 @@
   function handleLinkClick(event: MouseEvent) {
     const target = event.target as HTMLElement;
     const anchor = target.closest("a");
-    if (anchor?.href) {
-      event.preventDefault();
-      openUrl(anchor.href);
+    if (!anchor) return;
+
+    event.preventDefault();
+
+    const filePath = anchor.dataset.filepath;
+    if (filePath) {
+      void invoke("open_binary_file", { path: filePath });
+      return;
+    }
+
+    if (anchor.href) {
+      void openUrl(anchor.href);
     }
   }
 
@@ -453,4 +465,27 @@
     border-radius: 2px;
     padding: 0 2px;
   }
+
+  .markdown-content :global(.file-link) {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.25em;
+    color: var(--accent-primary, #f472b6);
+    text-decoration: none;
+    border: 1px solid color-mix(in srgb, var(--accent-primary) 30%, transparent);
+    background: color-mix(in srgb, var(--accent-primary) 8%, transparent);
+    border-radius: 4px;
+    padding: 0.1em 0.4em;
+    font-family: "JetBrains Mono", "Fira Code", monospace;
+    font-size: 0.875em;
+    cursor: pointer;
+    transition: all 0.15s ease;
+    word-break: break-all;
+  }
+
+  .markdown-content :global(.file-link:hover) {
+    background: color-mix(in srgb, var(--accent-primary) 18%, transparent);
+    border-color: color-mix(in srgb, var(--accent-primary) 60%, transparent);
+    color: var(--accent-secondary, #e879f9);
+  }
 </style>