Add variant editing to the FwLite viewer

[myieye]

Stacked on #2408. Adds "Variant of" and "Variants" fields to the entry editor (both views, shown by default), with a per-link "Variant type" checkbox menu on each link badge; new links default to Unspecified Variant like FLEx. Edits flow through updateEntry, so the demo project works unchanged; Playwright covers both directions plus the type toggle.

HideMinorEntry/Comment are modeled+synced (backend PR) but deliberately have no editor UI yet.

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[myieye]

Superseded by the iterative review workflow: the UI step will be re-opened as a cumulative PR (backend + UI) against develop so it gets CI and full reviews. Backend step review completed in #2408.