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/bank_panel.cpp

@@ -556,8 +556,11 @@ void drawTailFooter(LICE_IBitmap* bmp, int w, int h) {
     // matches the left inset; DT_RIGHT keeps it clear of the left-aligned tail label
     // (the two never overlap at normal panel widths — the label is short, the readout is
     // ~10 chars, and DT_END_ELLIPSIS on both degrades gracefully if a panel is ever tiny).
+    // COUPLED TO PruneButtonSpec::rightInset (prune_button.h): the prune button is
+    // right-anchored at footer.right - 84, placing its right edge 76 px left of this
+    // readout's right margin. If this inset (currently 8) changes, update rightInset there.
     RECT vrc = f;
-    vrc.right -= 8;
+    vrc.right -= 8;  // COUPLED: PruneButtonSpec::rightInset in prune_button.h is 84
     SetTextColor(dc, kRgbFooterVersion);
     DrawText(dc, reasampler::appVersion().c_str(), -1, &vrc,
              DT_RIGHT | DT_VCENTER | DT_SINGLELINE | DT_END_ELLIPSIS);
@@ -567,8 +570,9 @@ void drawTailFooter(LICE_IBitmap* bmp, int w, int h) {
 // of truth for both draw and hit-test (they never drift). Empty (button.empty()) when the
 // footer is degenerate or too narrow to place the button clear of the tail label — the
 // action stays reachable via its bindable command, so a suppressed button is graceful.
-// The version readout uses an 8 px right inset (drawTailFooter); the button's rightInset
-// clears it (~72 px) so the two never overlap at normal panel widths.
+// Clearance from the version readout: PruneButtonSpec::rightInset (84) places the button
+// right edge 76 px left of the readout's 8 px right margin — see coupling comments in
+// prune_button.h and drawTailFooter above.
 ButtonRect pruneButtonRectFor(int w, int h) {
     const RECT f = panelFooter(w, h);
     if (f.top >= f.bottom) return ButtonRect{};  // degenerate footer -> no button