feat(web): open device details from the energy screen

A "Urządzenia" card lists the Deye, Fronius and house meter as rows with
a "Szczegóły ›" chevron, 56 px high. Tapping one opens a bottom sheet on
a phone (a dialog on wide screens) with the grouped values; it closes by
button, backdrop or Escape and returns focus to the row.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/spec.md

@@ -86,7 +86,7 @@ Functional:
 - F4 Alarms with notifications: heat pump alarm, controller link lost, grid outage (house on battery).
 - F5 Health of backend, device links and tunnel.
 - F6 Later, low priority: show the weekly program (reading needs selector writes).
-- F7 Energy view: PV production, battery state, grid import/export, house consumption; day totals.
+- F7 Energy view: PV production, battery state, grid import/export, house consumption; day totals; a details panel per device (Deye, Fronius, house meter).
 
 Safety, for every write: