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/app_sweep.cpp

@@ -399,6 +399,11 @@ void App::buildSweepCatalog()
     add("market-rows-featured", ui::NavPage::Market,
         [](App& a) { if (a.settings_) a.settings_->setPortfolioStyle(2); },
         [](App& a) { if (a.settings_) a.settings_->setPortfolioStyle(0); });
+
+    // Console RPC command-reference popup (fixed-height dialog with a fill-height command list).
+    add("modal-console-commands", ui::NavPage::Console,
+        [](App& a) { a.console_tab_.sweepSetCommandsPopup(true); },
+        [](App& a) { a.console_tab_.sweepSetCommandsPopup(false); });
 }
 
 // ── State machine ───────────────────────────────────────────────────────────────────────────