feat(packaging): a Light installer target with no bundled node runtime

MeshBay Light ships the Electron client + UI only -- no PyInstaller node
freeze, no ffmpeg, no service install/autostart. Two standalone
electron-builder configs (Full via package.json's build field, Light via
electron-builder.light.yml passed with --config, which reads only that
file -- confirmed against app-builder-lib's own config loader) rather than
one config branching on a flag.

build-win-common.ps1 holds the steps both orchestrators share (Node check,
npm ci, Electron bump, sync-ui) so build-win.ps1 (Full) and the new
build-win-light.ps1 cannot drift apart; build-win.ps1 is refactored to
dot-source it with no behavior change (rebuilt and diffed byte-identical
output).

installer-light.nsh keeps the one thing Light still needs -- an
unconditional firewall rule, since the client listens too -- and none of
the service-mode/autostart machinery installer.nsh carries, which has
nothing to gate without a bundled node.

dist-light/ (Light's own electron-builder output dir) gets its own
.gitignore line since the bare dist/ rule does not match it.

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

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