1.9.93

v1.9.9.3 — Updates panel: resolve 'Checking…' banner when on latest

Tiny fix on the Update Logs panel. When you clicked 'Check for Updates'
while already on the latest version, the highlighted status banner stayed
stuck on 'Checking for updates…' forever \u2014 because renderUpdatesView()
only updated the pill text + changelog for the 'not-available' case and
never touched the persistent message banner the click handler had set.

- not-available: banner now reads 'No new updates as of now.'
- All other statuses (checking, available, downloading, downloaded) also
  drive the banner from one place so it always reflects the current
  state instead of whatever the click handler last set.
- Bonus: added displayVersion() to render package.json's numeric semver
  (1.9.93) back as the user-facing dotted form (1.9.9.3) in the Current
  Version pill, footer, and update-available toasts. Same trick maps the
  legacy 1.9.742 -> 1.9.7.4.2 so the older history reads correctly too.
- Footer bumped to v1.9.9.3.

No behavior change to the update mechanism itself \u2014 pure presentation.