feat: add UPS room sections and flexible custom sections

[Cyberhunter88]

Summary

This is a fresh PR that ports the upstream-compatible parts from my dashboard-strategy fork back to Simon42 Dashboard Strategy.

It intentionally does not include the fork rename / HACS rename changes from Cyberhunter88/dashboard-strategy, because those are only needed so my fork can be installed side-by-side with the original.

What changed

• Added automatic UPS/USV detection in room detail views.

  • Uses already visible/filtered registry entities, so existing hidden/no-dashboard filtering still applies.
  • Detects NUT devices directly.
  • Detects non-NUT UPS-like devices from a percentage battery sensor plus runtime/load/voltage style signals.
  • Renders each UPS as its own room section with a battery gauge and related sensor tiles.
  • Adds show_ups_in_rooms as an opt-out setting.

• Added per-area custom cards for room views.

  • Config path: areas_options.{areaId}.custom_cards[].
  • Supports guided tile mode.
  • Supports free YAML card mode.
  • Supports complete section YAML mode.
  • Supports top and bottom placement around generated room sections.

• Added configurable room stack ordering foundations.

  • Introduces StackKey and DEFAULT_STACKS_ORDER.
  • Allows areas_options.{areaId}.stacks_order.
  • Keeps saved order forward-compatible by appending new default stack keys automatically.

• Added flexible custom overview sections.

  • Adds custom_sections[] with title, icon and cards.
  • Adds custom_sections as a section-order target.
  • Keeps the existing custom cards target-section behavior intact.

• Updated editor/i18n support for the new settings.

• Rebuilt dist/ bundles for HACS compatibility.

Explicitly not included

• No rename from custom:simon42-dashboard to custom:dashboard-strategy.
• No rename of global custom elements/cards to dashboard-strategy-*.
• No HACS filename/resource rename.
• No fork branding changes.

Validation

• npm run lint passes.
• npm run build passes.
• Codacy was green on the previous equivalent PR after the same fixes.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 225 complexity · 0 duplication

Metric	Results
Complexity	225
Duplication	0

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