Start Mining was live regardless of which daemon the wallet was talking
to. It is a `start_mining` RPC to the connected node, so on a remote one
it is either refused — the button appearing to do nothing — or, if the
operator left the RPC open, it sets someone else's machine mining to our
address. Neither is a thing a wallet should offer.
The axe now greys out unless `Nodes::connection().isLocal()`, hovering it
explains why, and clicking anyway flashes the same notice rather than
silently doing nothing. `onStartMining` refuses too: the QML disables the
control, but a signal is not a promise.
isLocal() counts localhost, .local, 127/8 and the RFC1918 ranges, so the
embedded node and a daemon on the LAN both qualify.
Claude-Session: https://claude.ai/code/session_01VLQ5DsgKv23osGANoFT3zF
jwinterm
c7fca31653