feat: improve desktop reliability and customization

Address reliability and consistency gaps across Agent Runtimes, persistence, settings, Knowledge, Magic Notes, Smart Heartbeat, and the download site. Runtime processes now have bounded lifecycle cleanup and atomic configuration rollback, while model packages and persisted mutations recover safely.

Add a configurable global shortcut, protect unsaved work, improve modal and keyboard behavior, localize the built-in project without rewriting stored data, and lazy-load heavy renderer routes under enforced bundle budgets. Align project forms and disabled controls with shared typography and interaction states, and strengthen website release metadata validation and navigation accessibility.

Release note: 修复 Runtime、设置、知识库、魔法笔记与智能心跳中的可靠性和交互一致性问题；新增可配置全局快捷键，改进无障碍与加载性能，并强化官网下载校验。

src/main/agent/runtime-discovery.test.ts

@@ -1,10 +1,13 @@
+import { EventEmitter } from 'node:events'
 import { realpath } from 'node:fs/promises'
 import { basename, dirname } from 'node:path'
 import { fileURLToPath } from 'node:url'
-import { afterEach, describe, expect, it } from 'vitest'
+import { afterEach, describe, expect, it, vi } from 'vitest'
 import {
   detectAgentRuntimes,
-  detectRuntimeBinary
+  detectRuntimeBinary,
+  validateRuntimeVersion,
+  type RuntimeVersionProcess
 } from './runtime-discovery'
 
 const originalPath = process.env.PATH
@@ -24,6 +27,54 @@ afterEach(() => {
 })
 
 describe('runtime discovery', () => {
+  it('launches a detached POSIX version probe and awaits bounded tree cleanup', async () => {
+    const child =
+      new EventEmitter() as RuntimeVersionProcess & EventEmitter
+    child.exitCode = null
+    child.pid = 2718
+    child.kill = vi.fn()
+    child.stdout = new EventEmitter()
+    child.stderr = new EventEmitter()
+    const spawnProcess = vi.fn(() => child)
+    let releaseCleanup!: () => void
+    const cleanupBlocked = new Promise<void>((resolve) => {
+      releaseCleanup = resolve
+    })
+    const terminateProcessTree = vi.fn(async () => {
+      await cleanupBlocked
+    })
+
+    const validation = validateRuntimeVersion('runtime', {
+      platform: 'linux',
+      spawnProcess,
+      terminateProcessTree,
+      outputLimit: 4,
+      terminationWaitMs: 25
+    })
+    ;(child.stdout as EventEmitter).emit('data', '12345')
+    let completed = false
+    void validation.then(() => {
+      completed = true
+    })
+    await Promise.resolve()
+
+    expect(completed).toBe(false)
+    expect(spawnProcess).toHaveBeenCalledWith(
+      'runtime',
+      ['--version'],
+      expect.objectContaining({ detached: true })
+    )
+    expect(terminateProcessTree).toHaveBeenCalledWith(child, {
+      platform: 'linux',
+      processGroup: true,
+      signal: 'SIGKILL',
+      waitMs: 25
+    })
+
+    releaseCleanup()
+    await expect(validation).resolves.toEqual({ valid: false })
+  })
+
   it('canonicalizes and validates a configured ordinary file first', async () => {
     process.env.PATH = ''
     process.env.Path = ''