- Add FeatureFlag.isLightningEnabled flag (off)
- Gate dashboard_view_model.hasLightning behind the flag, which transitively
hides the LightningSwitcher in TopBar and the Lightning Username settings
row (both already gated on hasLightning)
- Remove CryptoCurrency.btcln from CryptoCurrency.all so it stops appearing
in any all-currencies pickers/lists
Lightning code paths (cw_bitcoin/lib/lightning/, lightning send/receive
pages) are intentionally left in place so the flag can be flipped back on
once we have an LSP / Greenlight node lined up.