fix(desktop): show dialog after "Check for Updates" menu action

[dpav02]

Fixes #954 — also addresses the root cause behind #359, which was closed with a workaround (install from .zip instead of .dmg) that does not resolve the issue. The installation method is irrelevant — the problem is that handleCheckForUpdatesMenuClick() discards the check result, so there is no feedback path regardless of how the app was installed.

What Changed

Extracted the menu-triggered update check into checkForUpdatesFromMenu(), which awaits the result and shows a native dialog:

• "You're up to date!" — when electron-updater reports no newer version
• "Update check failed" — with the error detail when the check errors

The existing fire-and-forget codepath for startup/poll checks is unchanged.

Why

The sidebar rocket button only appears for actionable states (available, downloading, downloaded). The checking and up-to-date states are intentionally hidden in the sidebar, which means menu-triggered checks have no visible feedback path. Users have been reporting this as "Check for Updates does nothing" since v0.0.3 (#359). This brings the behavior in line with standard macOS conventions (VS Code, Chrome, etc.).

Checklist

• This PR is small and focused
• I explained what changed and why
• N/A — no UI changes beyond the native OS dialog
• N/A — no animation/interaction changes

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[juliusmarminge]

@macroscope-app review this

[macroscopeapp]

Review complete! No issues found.

View the results here:

• Macroscope - Correctness Check