fix(material): wrap DialogWarningHeader so long warnings don't clip

Export All Keys' long DANGER warning was clipped at the card edge because the
header rendered a single unwrapped line. Add PushTextWrapPos so a long warning
flows to a second line; short one-line warnings (import/backup/settings) fit and
are unaffected. Surfaced by the Windows sweep on modal-export-all-keys.

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

src/ui/material/draw_helpers.h

@@ -1676,7 +1676,11 @@ inline void DialogWarningHeader(const char* warningLabel, const ImVec4& col = Wa
     ImGui::SameLine();
     // Vertically center the label with the taller warning glyph (stays within the icon's row height).
     if (iconH > textH) ImGui::SetCursorPosY(rowTop + (iconH - textH) * 0.5f);
+    // Wrap so a long warning flows to a second line instead of clipping at the card edge; short
+    // warnings (which fit) are unaffected.
+    ImGui::PushTextWrapPos(0.0f);
     ImGui::TextColored(col, "%s", warningLabel);
+    ImGui::PopTextWrapPos();
 }
 
 // 50/50 Cancel / confirm footer for overlay dialogs.  Sets `outCancel` /