fix(market): portfolio modal — hover assert, cut-off footer, plain heading, FX bleed, bigger delete icon

- Fix the ImGui error on hovering a group row: the per-row delete was an
  overlapping InvisibleButton + SetCursorScreenPos over the row Selectable. Replace
  it with a manual IsMouseHoveringRect / IsMouseClicked hit-test (no overlapping
  ImGui item, no cursor manipulation).
- Delete icon is larger (iconMed) and inset from the row edge (spacingMd).
- Footer no longer clipped: reserve 56px for the 40px buttons + separator.
- Manage-portfolio heading is now plain text (h6) with no title-bar background or
  divider — content floats on the backdrop.
- Sidebar theme-effect borders no longer bleed through the overlay: suppress panel
  theme-effects frame-wide (RAII guard in App::render via ui::PortfolioEditorActive)
  while the modal is open, instead of only during the market render.

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

src/app.cpp

@@ -1243,6 +1243,17 @@ void App::render()
     // Process deferred encryption from wizard (runs in background)
     processDeferredEncryption();
 
+    // While the full-window portfolio modal is open, suppress panel theme-effects for the whole
+    // frame so their foreground-draw-list borders (sidebar included) don't bleed over the overlay.
+    // RAII-restored to the prior state on any return path.
+    struct FxSuppressGuard {
+        bool active;
+        explicit FxSuppressGuard(bool on) : active(on) {
+            if (active) ui::effects::ThemeEffects::instance().setEnabled(false);
+        }
+        ~FxSuppressGuard() { if (active) ui::effects::ThemeEffects::instance().setEnabled(true); }
+    } fxGuard(ui::PortfolioEditorActive() && ui::effects::ThemeEffects::instance().isEnabled());
+
     // Main content area - use full window (no menu bar)
     ImGuiViewport* viewport = ImGui::GetMainViewport();
     ImGui::SetNextWindowPos(viewport->WorkPos);