Move dashboard home page to vue 3 rollout

What does this MR do and why?

This MR adds the beta feature flag vue3_migrate_dashboard_home. The flag is off by default. It opts the /dashboard/home page into Vue 3 compatibility mode.

The homepage has two routes. The route / already runs on Vue 3, but /dashboard/home had no Vue 3 build. Both routes mount the same homepage app.

When the flag is on, Rails serves the pages.dashboard.home.vue3 bundle. When the flag is off, Rails serves the Vue 2 bundle. Nothing changes while the flag is off.

Screenshots

Both screenshots show /dashboard/home in GDK. The page looks the same with the flag off and on. The greeting line changes on every load.

Flag off: pages.dashboard.home (Vue 2)	Flag on: pages.dashboard.home.vue3 (Vue 3)

How to set up and validate locally

1. In the Rails console, run Feature.enable(:vue3_migrate_dashboard_home).
2. Visit /dashboard/home.
3. Confirm the page loads the pages.dashboard.home.vue3 bundle (Network tab), and that the homepage widgets render.
4. Confirm the browser console shows no Vue errors.
5. Run Feature.disable(:vue3_migrate_dashboard_home), reload, and confirm the page loads pages.dashboard.home.

References

• Work item: #608106 (closed)
• Same pattern for the other dashboard pages: !251248 (merged)
• Same pattern for the root page: !254091 (merged)

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.