fix(ui): console-commands modal slide + wallets footer clipping

Two follow-ups to the modal float work:

- Console RPC command reference (renderCommandsPopup) had the SAME auto-height
  feedback bug as Wallets: BlurFloat with no cardHeight, and its fill-height
  command list read GetContentRegionAvail() inside the AutoResizeY child ->
  self-referential, sliding content off-screen after a monitor move. Give it a
  FIXED viewport-relative cardHeight (fills ~84% of the viewport). Also removed
  its duplicate body H6 heading (the framework h6 title already shows it) —
  missed earlier because it's spec-form, not the positional overload.

- Wallets footer clipping: after the fixed-height conversion the content child
  clips overflow (NoScrollbar), and the hardcoded 130*dp reserve below the table
  was too small for the create/add-folder rows + separator + footer (~160*dp),
  so the buttons clipped — worse at 150%. Compute the reserve from real widget
  metrics (GetFrameHeightWithSpacing + caption height) so it holds at any DPI.

Added a modal-console-commands sweep surface (debug-gated ConsoleTab setter) so
the popup is captured. Verified both at 100% and font_scale 1.5 (150%): footers
on-screen, single headings, lists fill, nothing clipped.

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

src/ui/windows/console_tab.h

@@ -47,7 +47,11 @@ public:
      * Must be called outside any child window so the modal blocks all input.
      */
     void renderCommandsPopupModal();
-    
+
+    // Debug/UI-sweep hook: force the RPC command-reference popup open/closed so the full UI sweep
+    // can capture it (the popup is otherwise opened only by a toolbar button).
+    void sweepSetCommandsPopup(bool open) { show_commands_popup_ = open; }
+
     /**
      * @brief Add a line to the console output
      */