test(10-05): bring every SPA module, composable and component under Vitest

- 41 unit and component suites under admin/tests/{app,state,shell,list,form,relation,views,ui}
  covering states and a11y roles; every src module is imported by a test
- typed fixture helper assigns each JSON fixture to its generated OpenAPI type
- fix: iconFor ignores inherited object members such as "constructor"
- fix: field controls import ./control instead of the registry (import cycle
  left a renderer unregistered depending on module load order)
- fix: dropdown shows the placeholder for an unknown stored value next to an emptyOption
- fix: list announces a failed schema load even when the rows arrive after it
- tailwind no longer scans admin/tests; boardwalk/dist rebuilt

admin/tests/app/runtime.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from 'vitest'
+import { DEFAULT_BASE, readBase, runtime } from '../../src/app/runtime'
+
+function docWith(content: string | null): Document {
+  const doc = document.implementation.createHTMLDocument('test')
+  if (content !== null) {
+    const meta = doc.createElement('meta')
+    meta.setAttribute('name', 'summer-admin-base')
+    meta.setAttribute('content', content)
+    doc.head.appendChild(meta)
+  }
+  return doc
+}
+
+describe('runtime base', () => {
+  it('derives the router base and the API base from the served meta', () => {
+    expect(runtime.base).toBe('/admin-test')
+    expect(runtime.api).toBe('/admin-test/api/v1')
+  })
+
+  it('reads a custom prefix and trims trailing slashes and whitespace', () => {
+    expect(readBase(docWith('/acp'))).toBe('/acp')
+    expect(readBase(docWith(' /acp/panel// '))).toBe('/acp/panel')
+  })
+
+  it.each([
+    ['a missing meta', null],
+    ['an empty value', ''],
+    ['the unreplaced build token', '__SUMMER_ADMIN_BASE__'],
+    ['a relative path', 'backend'],
+    ['an absolute URL', 'https://evil.example/backend'],
+    ['the root alone', '/'],
+    ['slashes only', '///'],
+  ])('falls back to the default for %s', (_label, content) => {
+    expect(readBase(docWith(content))).toBe(DEFAULT_BASE)
+  })
+
+  it('uses /backend as the default', () => {
+    expect(DEFAULT_BASE).toBe('/backend')
+  })
+})