[Oracle/Client] Report card database download progress (#7253)

* [Oracle/Client] Report card database download progress

Card database updates ran invisibly: MTGJSON parsing spun an indeterminate
bar on the UI thread and the set import blocked the window, while the
onboarding wizard spawned `oracle -b` with no progress to show at all.

- Add byte-level scan progress to `RawJson::scanSetRanges` via an optional
  callback, throttled to ~100 reports per scan.
- Emit `OracleImporter::dataReadProgress` during the scan and import sets on a
  worker thread, driving the wizard's progress bar per set.
- With `-b`, write machine-readable `PROGRESS <stage> <done> <total>` lines to
  stdout for the download/scan/import stages; stderr keeps the log output.
- Parse the oracle stdout in `MainWindow` and forward it to the onboarding
  wizard, giving the card database step a determinate bar with stage-specific
  status text.
- Guard the async workers against the wizard being closed mid-run.
- Add Google Test coverage for scan progress reporting.

* [Oracle/Client] Harden oracle progress workers and quit prompt

Address review feedback on the download-progress change: decompress and read
sets files off the UI thread, cancel the load/import workers before the
wizard can tear down the importer, and show an 'Extracting file...' status
plus a clean 100% tail so the poll never looks stuck. Quitting Cockatrice
while a card database update runs now asks for confirmation.

* Show 100% for 500ms on complete.

* Disable buttons on set import until done.

* Clean up progress bar.

* Drop wrapper around lambda

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

cockatrice/src/interface/window_main.h

@@ -68,6 +68,11 @@ signals:
     /** @brief Emitted after the background card-database update subprocess exits. */
     void cardDatabaseUpdateFinished(bool success);
 
+    /** @brief Emitted while the background card-database update subprocess runs.
+     *         @p stage is one of "download", "scan" or "import"; @p done/@p total
+     *         are byte counts for the first two stages and set indices for "import". */
+    void cardDatabaseUpdateProgress(const QString &stage, qint64 done, qint64 total);
+
 public slots:
     void actCheckCardUpdates();
     void actCheckCardUpdatesBackground();
@@ -96,6 +101,7 @@ private slots:
 
     void cardUpdateError(QProcess::ProcessError err);
     void cardUpdateFinished(int exitCode, QProcess::ExitStatus exitStatus);
+    void cardUpdateProgressOutput();
     void refreshShortcuts();
     void cardDatabaseLoadingFailed();
     void cardDatabaseNewSetsFound(int numUnknownSets, QStringList unknownSetsNames);
@@ -159,6 +165,7 @@ private:
     LatencyStatusWidget *latencyStatus = nullptr; ///< status bar widget with live round-trip stats and history graph
     bool bHasActivated, askedForDbUpdater;
     QProcess *cardUpdateProcess;
+    QByteArray cardUpdateOutputBuffer;
     DlgViewLog *logviewDialog;
     GameReplay *replay;
     DlgTipOfTheDay *tip;