fix(ui): make HiDPI-overflowing containers scrollable — wizard, overlay dialogs, balance recent-tx

At font_scale 1.5 (dpiScale 1.5) three fixed, non-scrolling containers clipped
content off the bottom with no scroll escape:

- First-run wizard: the hand-drawn cards grow ~1.5x past the fixed window,
  pushing Continue / Encrypt & Continue / Skip off-screen (a setup blocker).
  Inject a wheel-driven scroll offset into the layout seed + a scroll indicator;
  gate the wheel on !IsPopupOpen + NoPopupHierarchy so an open combo popup does
  not scroll the wizard behind it. No-op at 1.0x.
- Overlay dialogs (BeginOverlayDialog): auto-height cards taller than the
  viewport (About, Request Payment) ran their footer off the bottom. Add a
  sticky per-open overflow flag that clamps the card to the viewport and makes
  the content child scrollable; short dialogs still center unchanged. Give the
  nested settings clear-history confirm its own idSuffix so it can't inherit the
  parent dialog's overflow state or collide on the child window id.
- Balance Recent Transactions: the dp-scaled address card evicted the recent-tx
  list off the non-scrolling tab host. Cap the card inside RenderSharedAddressList
  against the space that actually remains (minus a caller-provided reserve) so
  the section below stays on-screen — covers all 10 balance layouts.

Verified at font_scale 1.5 across full-node + Lite + Windows (ctest green) and an
adversarial diff review (two low-severity regressions found + fixed).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/ui/windows/balance_components.h

@@ -26,7 +26,8 @@ extern bool s_generating_z_address;
 void UpdateBalanceLerp(App* app);
 void RenderCompactHero(App* app, ImDrawList* dl, float availW, float hs, float vs,
                        float heroHeightOverride = -1.0f);
-void RenderSharedAddressList(App* app, float listH, float availW, float glassRound, float hs, float vs);
+void RenderSharedAddressList(App* app, float listH, float availW, float glassRound, float hs, float vs,
+                             float reserveBelow = 0.0f);
 void RenderSharedRecentTx(App* app, float recentH, float availW, float hs, float vs);
 void RenderSyncBar(App* app, ImDrawList* dl, float vs);