updater: SLR auto-update + wire fluorine updater badge, bump 0.2.0

- OrganizerCore: add fluorineUpdater() getter + checkForSlrUpdates()
  fired from startup checkForUpdates(); detached thread runs downloadSlr
  when SLR already installed so steamrt4 BUILD_ID drift is picked up
  without a launch-time stall.
- MainWindow: connect FluorineUpdater::updateAvailable to existing
  updateAvailable() slot so the statusbar badge + actionUpdate light up;
  on_actionUpdate_triggered routes to Settings -> Updates when a Fluorine
  update is pending (the MO2 self-updater path is no-op'd).
- MainWindow launch path: drop !isSlrInstalled() short-circuit; fresh
  installs still get the progress dialog, up-to-date checks rely on the
  startup background pass.
- SettingsDialog: selectTabByLabel() so MainWindow can open Updates tab.
- Launcher: rm -rf update-staging/ once a new bundle has synced into
  bin/, so the in-app updater doesn't accumulate stale extracts.
- CMakeLists.txt: 0.1.4 -> 0.2.0.

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

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