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.h

@@ -25,6 +25,11 @@ QStringList canonicalStages();
 
 bool isValid(const QString &stage);
 
+/// Canonical-case spelling for a stage matched case-insensitively
+/// ("rejected" -> "Rejected", "start" -> Start). Unknown input is returned
+/// unchanged.
+QString canonical(const QString &stage);
+
 /// Sankey column index. Start = 0; Applied..Offer walk the funnel; the three
 /// terminal outcomes (Accepted/Rejected/Withdrawn/Ghosted) share the last
 /// column so a rejection right after Applied is still a valid (longer) link.