[prop4n]

Replaces the per-card action buttons with a right-hand detail drawer opened by
clicking a resource (card or graph node). The drawer shows desired vs observed
config, history, and actions.

Backend

• GET /api/v1/resources/{kind}/{name} returns { desiredYAML, observed }:
  • desiredYAML: the matched manifest re-marshaled (uniform across kinds).
  • observed: best-effort cluster state — VM/Template matched by vmid
    (present/cores/memory/cpu/running/ip/nameserver), ISO by presence.
  • 404 when the resource isn't declared.
• New ResourceDetailer (implemented by app), wired via server Options. The
  observe logic takes a small clusterObserver interface (unit-tested with a fake).

Frontend

• ResourceDetail.vue: a right drawer with header (name/kind/status), Desired
  (YAML block), Observed (key/values, "not present" when absent), History
  timeline, and a Delete action (two-step confirm, ISO + VM).
• A tiny stores/selection.ts holds the selected resource; the drawer fetches
  detail + events on open.
• ResourceCard is now a click-to-select button; the trash and history buttons
  are gone (they live in the drawer). Selected card gets a ring. Works in both the
  card view and the graph (nodrag).

Tests

• App: observe-by-vmid, observe-absent, ISO presence.
• Route registered (verified: GET returns 401 unauth, not 405).
• Go + vitest suites, golangci-lint (v2), gofmt clean.

Non-goals

Live-streaming observed config, daemon-log lines in the drawer (separate logs
increment), editing from the panel.