Dedicated Updates tab, controller + ntsync fixes, titlebar polish

- New Settings > Updates tab (src/src/settingsdialogupdates.{h,cpp}):
  current build info (version, channel, commit, timestamp), channel
  picker, startup-check toggle, and a "Check for updates now" button
  with live status. Legacy widgets on the General tab are now hidden.
- Downgrade warning: suppress the "your version is lower than before"
  log when lastVersion is 2.x.y (upstream MO2 / pre-Fluorine schema)
  and currentVersion is 0.x.y — that's a schema switch, not a
  downgrade.
- Titlebar: beta builds show "beta @ <short-sha>" instead of a static
  semver so each rolling build is identifiable at a glance. Stable
  still shows semver. Renamed to "Fluorine Manager" in the title.
- Controllers: remove the four xinput* "native" overrides from the
  prefix registry seed. Games that ship their own xinput1_3.dll
  (Fallout 4, Skyrim, etc.) make Wine's builtin (SDL-backed) lose to
  a Windows stub that can't talk to /dev/input, so controllers went
  silent. Leaving xinput unset lets Wine builtin win.
- ntsync fallback: detect a missing /dev/ntsync at launch and set
  PROTON_NO_NTSYNC=1 / WINENTSYNC=0 / WINE_DISABLE_FAST_SYNC=1 so
  pre-6.14 kernels stop dying with "Cannot open synchronization
  device: No such file or directory".

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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