filter drop targets

[benderl]

modify nested list component to:

• only show drop target if valid for the current component type
• only allow nesting of batteries inside inverters

[Copilot]

Copilot review overview

🟡 Changes recommended

Battery drops are still accepted by group and counter targets, contrary to the stated nesting restriction.

Review effort: Lite
Findings: 1

Open (1)

• Reject batteries nested directly in groups or counters · New

What changed in this PR

Updates the nested list to filter valid drop targets and enforce component-specific nesting rules.

Changes:

• Filters visible nested drop targets by component type.
• Adds drag-and-drop validation.
• Restricts inverter nesting to batteries.

File	Summary
src/​components/​OpenwbNestedList.vue	Implements filtered drop targets and nesting validation; battery drops into groups or counters still require correction.

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