Add modal-based tool panels for multi-grid, super-resolution, and inpaint in canvas image-to-image workflow. Grid mode selector only appears for models that support multi-image generation (wan2.7-image, gpt-image-2). Also fixes merge conflict markers in CSS and adds missing toast import.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Payment gateway is not yet configured, so hide the recharge flow
and show an informational toast when users click the balance button.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>