fix(prune): honest reclaim/skip counts; cross-ref layout coupling

Already-absent files no longer inflate reclaimedCount (outAlreadyAbsent
distinguishes vanished-at-delete from real failures). Stale skip count
de-dups confirmed before subtraction so duplicates aren't tallied as
stale. prune_button.h rightInset and drawTailFooter vrc.right now
cross-reference each other by name.

src/prune_button.h

@@ -59,7 +59,12 @@ struct ButtonRect {
 //   * buttonWidth   — the button's fixed width.
 //   * rightInset    — gap from the footer's right edge to the button's right edge (the
 //                     button sits left of this inset, clearing the right-aligned version
-//                     readout which uses its own inset).
+//                     readout). COUPLED TO drawTailFooter (bank_panel.cpp): the version
+//                     readout uses `vrc.right -= 8` (8 px right margin). The button's
+//                     right edge lands at footer.right - 84, i.e. 76 px left of the
+//                     readout's right margin — enough clearance for the ~10-char label.
+//                     If the version readout's inset changes in drawTailFooter, update
+//                     this value to maintain clearance.
 //   * verticalInset — top/bottom gap inside the footer (the button is shorter than the
 //                     strip so it reads as a raised control, not a full-height fill).
 //   * minLeftInset  — the button's left edge must stay at least this far from the footer
@@ -68,7 +73,7 @@ struct ButtonRect {
 //                     rect (button suppressed — see header placement contract).
 struct PruneButtonSpec {
     int buttonWidth = 72;
-    int rightInset = 84;
+    int rightInset = 84;  // COUPLED: version readout in drawTailFooter uses vrc.right -= 8
     int verticalInset = 4;
     int minLeftInset = 120;
 };