chore: 官网拆分 homepage + 关于页瘦身 + 端口 5175（当前可用状态基线）

test/platform/invoke.test.ts

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+import { beforeEach, describe, expect, it, vi } from 'vitest'
+
+const { invokeMock } = vi.hoisted(() => ({ invokeMock: vi.fn() }))
+vi.mock('@tauri-apps/api/core', () => ({ invoke: invokeMock }))
+vi.mock('../../src/platform/runtime', () => ({ isTauriRuntime: () => true }))
+
+import { invokeEnvelope, invokeNative, NativeCommandError } from '../../src/platform/invoke'
+
+describe('native error boundary', () => {
+  beforeEach(() => vi.clearAllMocks())
+
+  it('preserves business failures as envelopes', async () => {
+    const response = { success: false, error: 'bad data', errorCode: 'native.invalidBase64' }
+    invokeMock.mockResolvedValueOnce(response)
+    expect(await invokeNative('write_file')).toBe(response)
+  })
+
+  it('normalizes structured rejections without losing their code or cause', async () => {
+    const cause = { error: 'invalid encoding', errorCode: 'native.invalidBase64' }
+    invokeMock.mockRejectedValueOnce(cause)
+    const error = await invokeNative('write_file').catch((value: unknown) => value)
+    expect(error).toBeInstanceOf(NativeCommandError)
+    expect(error).toMatchObject({
+      command: 'write_file',
+      detail: 'invalid encoding',
+      errorCode: cause.errorCode,
+      originalError: cause,
+    })
+    expect((error as Error).message).not.toContain('[object Object]')
+  })
+
+  it('retains codes when adapting rejected calls to envelopes', async () => {
+    invokeMock.mockRejectedValueOnce({ error: 'join failed', errorCode: 'native.taskJoin' })
+    expect(await invokeEnvelope('read_file')).toMatchObject({ success: false, errorCode: 'native.taskJoin' })
+  })
+
+  it('preserves plain rejection messages', async () => {
+    invokeMock.mockRejectedValueOnce('custom native failure')
+    await expect(invokeNative('test')).rejects.toThrow('custom native failure')
+  })
+})