v0.1.3: redesign the Sankey pipeline layout

- Spread columns by rank among the stages actually present, so sparse
  pipelines fill the width instead of leaving dead stretches
- Top-align columns: the funnel's success path runs level along the top
  and drop-off ribbons only ever descend
- Give each ribbon its slot per node side (outgoing by target height,
  incoming by source height) so ribbons stop braiding over each other
- Move the last column's labels to its left so they always stay
  on-screen, with a theme halo to stay legible over ribbons
- Never hide small-node labels; elide with tooltip instead
- Guarantee columns and ribbons fit the viewport (clamp-aware scale,
  spill-proof ribbon thickness)
- Debounce resize relayouts and stop re-querying SQLite on resize
- Canonicalize stage names on write (CLI "rejected" -> "Rejected") and
  repair pre-existing rows on database open
- Take Sankey node width/padding from Kirigami units
- Add QuickShapesPrivate configure-time guard for QtQuick.Shapes
- Extend sankeylayouttest: viewport fit, ribbon containment, slot
  ordering, sparse-column spread, canonicalization, degenerate sizes
- README: build-dependency and generator fixes, document SettingsPage

Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_019FXfh48mASRsE1WEhy9jcM

src/jobstage.cpp

@@ -32,6 +32,19 @@ bool isValid(const QString &stage)
     return canonicalStages().contains(stage, Qt::CaseInsensitive);
 }
 
+QString canonical(const QString &stage)
+{
+    if (stage.compare(QLatin1String(Start), Qt::CaseInsensitive) == 0) {
+        return QString::fromLatin1(Start);
+    }
+    for (const QString &candidate : canonicalStages()) {
+        if (stage.compare(candidate, Qt::CaseInsensitive) == 0) {
+            return candidate;
+        }
+    }
+    return stage;
+}
+
 int column(const QString &stage)
 {
     static const QHash<QString, int> columns{