feat: gate the create-group wizard on whether a node is bundled

MeshBay Light has no bundled meshbay-node.exe, so the create-group wizard
(which assumes it can start a local node) needs its own signal, not just
platform.node.available. main.js exposes it over IPC (node:bundled) by
checking the packaged resources directory rather than trusting a build-time
constant; preload.js and platform.js carry it through the usual
contextBridge/wrapper path.

winCanElevateServiceMode() replaces the two prior 'app.isPackaged' checks
for whether the app can offer service-mode elevation -- Light is packaged
but has no service-mode.ps1 to elevate into, so packaged alone was already
the wrong test even before this target existed.

create-group-page.js gates the wizard step that starts a node on the new
capability instead of hiding the whole feature; node-page.js's comment fix
is unrelated cosmetic drift caught in the same pass.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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