chore(client): build against the latest Electron, and stop defining the package twice

Chromium CVEs are fixed in Electron releases, and a client built against
an old one ships those holes to every user. That is a certain harm; a
build that breaks on a new Electron is a repairable one. build-client.sh
now bumps to the latest on every build, prints the comparison, and lets
the build fail if it cannot cope — the failure is the signal to fix, not
a reason to stay behind. It writes package.json and the lockfile on
purpose: the new pin is meant to be committed. A registry it cannot reach
is a warning, not a failure.

Exercised by pinning back to 42.9.2 and building: "==> Electron 42.9.2 ->
44.1.1", exit 0, electron=44.1.1 in the packaged output. Note npm audit
would have said nothing about any of this — Chromium CVEs fixed in
Electron do not reliably reach the npm advisory database.

Separately, package.json declared linux.target [deb, rpm] with its own
deb/rpm depends, so `npm run dist` built a second package under the same
name. The two had drifted: /opt/MeshBay/meshbay-client against
/opt/meshbay-client/meshbay, and Depends: python3-meshbay-common naming
none of the Electron runtime libraries the real DEBIAN/control lists — it
would have installed cleanly and then refused to start. Nothing in the
tree referenced `npm run dist`, which is why the drift was free to
happen. That config is gone, "dist" delegates to build-client.sh, and
test_desktop_shell.py refuses its return.

`--dir` was re-run with no linux block at all: exit 0, same binary
build-client.sh consumes. It needs appId, productName and files, nothing
else.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AbwJDbNTkiRUh7HTWEoyss

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