feat(client): create the system tray at launch, not on first minimise

ensureTray() was reachable only from the window:minimize-to-tray handler, so
the indicator did not exist until you had already hidden the window into it.
That is backwards on both desktops — most of what a tray is for is finding an
application that is not in front of you — and on Windows it read as the app
having no tray presence at all.

Created during app.whenReady(), after registerBridge() and before
createWindow(). The order matters: buildTrayMenu reads the nodeService that
registerBridge assigns, so the other way round puts the Start/Stop entry on
the menu one five-second poll late.

The menu's labels were the one thing that came *from* the minimise call, since
the main process has no i18n. A new tray:labels IPC (platform.setTrayLabels)
carries them instead, sent from the renderer's boot once initLocale() has a
catalogue; a language change reloads the page, so the same call covers it. The
window between launch and that first message shows TRAY_FALLBACK, in English.

§5.10's two platform gates become one — trayOS() in main.js, which every tray
path calls. test_desktop_shell.py's existing test is rewritten against it and
two are added: the launch ordering, and that no tray path tests
process.platform inline instead of calling the gate.

Windows still files a new tray icon under hidden icons until the person drags
it onto the taskbar. No API promotes it; documented in WINDOWS-PORT.md §5.11
rather than worked around.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V8EDjk6pkYZrCbo63m2x87

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