ClassDetailPanel: isSuggestionMode prop is declared but unused

[damienriehl]

Problem

ClassDetailPanelProps declares isSuggestionMode?: boolean (components/editor/ClassDetailPanel.tsx:74), and both editor layouts pass it (Standard line 455, Developer line 559). The component does not destructure or read it anywhere — it is dead code at the type-system level only.

This was introduced when the per-panel "Edit Item" button was removed in PR #104. The companion panels (PropertyDetailPanel, IndividualDetailPanel) don't have the prop at all.

Why it matters

• Misleading: callers think they are toggling something they aren't.
• Drift risk: a future reader may try to wire it up and accidentally re-introduce read-only behavior in the editor.

Proposed fix

One of:

1. Remove isSuggestionMode from ClassDetailPanelProps. Callers should drop the prop too.
2. If a real semantic difference is intended in suggestion mode (e.g., warning banner, tinted save bar), wire it through.

Option 1 is the lower-risk change.

Refs

• Surfaced during review of PR feat: preserve entity selection across viewer/editor modes #104 (closes Preserve entity selection across viewer/editor and unify continuous editing #98).