chore: migrate tests from tests-ui/ to colocate with source files (#7811)

## Summary

Migrates all unit tests from `tests-ui/` to colocate with their source
files in `src/`, improving discoverability and maintainability.

## Changes

- **What**: Relocated all unit tests to be adjacent to the code they
test, following the `<source>.test.ts` naming convention
- **Config**: Updated `vitest.config.ts` to remove `tests-ui` include
pattern and `@tests-ui` alias
- **Docs**: Moved testing documentation to `docs/testing/` with updated
paths and patterns

## Review Focus

- Migration patterns documented in
`temp/plans/migrate-tests-ui-to-src.md`
- Tests use `@/` path aliases instead of relative imports
- Shared fixtures placed in `__fixtures__/` directories

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7811-chore-migrate-tests-from-tests-ui-to-colocate-with-source-files-2da6d73d36508147a4cce85365dee614)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: GitHub Action <action@github.com>

tests-ui/tests/components/queue/JobGroupsList.test.ts

@@ -1,93 +0,0 @@
-import { mount } from '@vue/test-utils'
-import { afterEach, describe, expect, it, vi } from 'vitest'
-import { defineComponent, nextTick } from 'vue'
-
-import JobGroupsList from '@/components/queue/job/JobGroupsList.vue'
-import type { JobGroup, JobListItem } from '@/composables/queue/useJobList'
-
-const QueueJobItemStub = defineComponent({
-  name: 'QueueJobItemStub',
-  props: {
-    jobId: { type: String, required: true },
-    workflowId: { type: String, default: undefined },
-    state: { type: String, required: true },
-    title: { type: String, required: true },
-    rightText: { type: String, default: '' },
-    iconName: { type: String, default: undefined },
-    iconImageUrl: { type: String, default: undefined },
-    showClear: { type: Boolean, default: undefined },
-    showMenu: { type: Boolean, default: undefined },
-    progressTotalPercent: { type: Number, default: undefined },
-    progressCurrentPercent: { type: Number, default: undefined },
-    runningNodeName: { type: String, default: undefined },
-    activeDetailsId: { type: String, default: null }
-  },
-  emits: ['cancel', 'delete', 'menu', 'view', 'details-enter', 'details-leave'],
-  template: '<div class="queue-job-item-stub"></div>'
-})
-
-const createJobItem = (overrides: Partial<JobListItem> = {}): JobListItem => ({
-  id: 'job-id',
-  title: 'Example job',
-  meta: 'Meta text',
-  state: 'running',
-  iconName: 'icon',
-  iconImageUrl: 'https://example.com/icon.png',
-  showClear: true,
-  taskRef: { workflow: { id: 'workflow-id' } },
-  progressTotalPercent: 60,
-  progressCurrentPercent: 30,
-  runningNodeName: 'Node A',
-  ...overrides
-})
-
-const mountComponent = (groups: JobGroup[]) =>
-  mount(JobGroupsList, {
-    props: { displayedJobGroups: groups },
-    global: {
-      stubs: {
-        QueueJobItem: QueueJobItemStub
-      }
-    }
-  })
-
-afterEach(() => {
-  vi.useRealTimers()
-})
-
-describe('JobGroupsList hover behavior', () => {
-  it('delays showing and hiding details while hovering over job rows', async () => {
-    vi.useFakeTimers()
-    const job = createJobItem({ id: 'job-d' })
-    const wrapper = mountComponent([
-      { key: 'today', label: 'Today', items: [job] }
-    ])
-    const jobItem = wrapper.findComponent(QueueJobItemStub)
-
-    jobItem.vm.$emit('details-enter', job.id)
-    vi.advanceTimersByTime(199)
-    await nextTick()
-    expect(
-      wrapper.findComponent(QueueJobItemStub).props('activeDetailsId')
-    ).toBeNull()
-
-    vi.advanceTimersByTime(1)
-    await nextTick()
-    expect(
-      wrapper.findComponent(QueueJobItemStub).props('activeDetailsId')
-    ).toBe(job.id)
-
-    wrapper.findComponent(QueueJobItemStub).vm.$emit('details-leave', job.id)
-    vi.advanceTimersByTime(149)
-    await nextTick()
-    expect(
-      wrapper.findComponent(QueueJobItemStub).props('activeDetailsId')
-    ).toBe(job.id)
-
-    vi.advanceTimersByTime(1)
-    await nextTick()
-    expect(
-      wrapper.findComponent(QueueJobItemStub).props('activeDetailsId')
-    ).toBeNull()
-  })
-})