♻️ refactor(frontend): split HealthDashboard into smart wrapper + dumb View for state-based stories (#33)

SRP split: HealthDashboardView (presentational, props-based) + HealthDashboard (smart wrapper, useFetch). Enables 4 Storybook stories per state + unit testability per branch. Existing testids preserved, Playwright tests still pass.

Co-authored-by: Gabriel Radureau <arcodange@gmail.com>
Co-committed-by: Gabriel Radureau <arcodange@gmail.com>

frontend/shims-vue.d.ts

@@ -0,0 +1,6 @@
+declare module '*.vue' {
+  import type { DefineComponent } from 'vue'
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const component: DefineComponent<any, any, any>
+  export default component
+}