initialize Electron desktop app and remove unused files

tests/client/model-selector-provider-sync.test.ts

@@ -0,0 +1,51 @@
+import { readFileSync } from 'fs'
+import { describe, expect, it } from 'vitest'
+
+const readClientFile = (path: string) => readFileSync(`packages/client/src/${path}`, 'utf8')
+
+// 从 `computed(` 的左括号开始做括号配平，精确切出这个表达式的范围。
+// 用空行切分不行：箭头函数写成单行后，紧邻的下一个顶层声明只隔一个空行。
+function balancedBlock(source: string, header: string): string {
+  const start = source.indexOf(header)
+  expect(start, `${header} not found`).toBeGreaterThan(-1)
+
+  let depth = 0
+  for (let i = start + header.length - 1; i < source.length; i += 1) {
+    if (source[i] === '(') depth += 1
+    if (source[i] === ')') {
+      depth -= 1
+      if (depth === 0) return source.slice(start, i + 1)
+    }
+  }
+  return source.slice(start)
+}
+
+// known-issues #1: `providerOptions` 的 computed getter 内部给 customProvider
+// 赋值。用户手动挑好的 provider 会被下一次 getter 重算无声改回去，表现为
+// 「自己跳」。修法是把同步移进 watch，让 getter 恢复成纯读。
+describe('ModelSelector provider selection', () => {
+  it('keeps the providerOptions getter free of side effects', () => {
+    const source = readClientFile('components/layout/ModelSelector.vue')
+    const block = balancedBlock(source, 'const providerOptions = computed(')
+
+    expect(block).not.toContain('customProvider.value =')
+  })
+
+  it('syncs customProvider from the store through a watch', () => {
+    const source = readClientFile('components/layout/ModelSelector.vue')
+    const block = balancedBlock(source, 'watch(')
+
+    // 同步点必须挂在 selectedProvider 上，而不是挂在 providerOptions 上 ——
+    // 后者等于把同一个副作用换个地方写一遍。
+    expect(block.slice(0, 200)).toContain('appStore.selectedProvider')
+    expect(block).toContain('customProvider.value =')
+  })
+
+  it('still initialises the provider when the picker opens', () => {
+    // watch 是懒的：不会在初始渲染时触发。openModal 的这一次赋值是首帧
+    // 唯一来源，不能跟着一起去掉。
+    const source = readClientFile('components/layout/ModelSelector.vue')
+
+    expect(source).toMatch(/function openModal\(\)[\s\S]*?customProvider\.value = appStore\.selectedProvider/)
+  })
+})