feat: send gen params to workflow with visual cues

- Add genParamsMapper.js: sampler/scheduler display→internal mapping,
  combined-name parsing, widget matching
- Add sendGenParamsToWorkflow() in uiHelpers.js: resolves sampler,
  fetches registry by send_gen_params marker, sends via update-node-widget
- Add send-params-btn UI in showcase hover panel and recipe modal
- Add flashWidget() in workflow_registry.js: text-color visual cue
  on updated widget values (Vue: inline style + CSS, canvas: property shadow)
- Add silent option to sendWidgetValueToNodes for consolidated toast
- Normalize param display labels (cfg_scale→CFG, etc.) in recipe modal
- Add 33 tests for genParamsMapper; update existing test assertions

templates/components/recipe_modal.html

@@ -90,7 +90,17 @@
                         </div>
                         
                         <!-- Other Parameters -->
-                        <div class="other-params" id="recipeOtherParams"></div>
+                        <div class="param-group info-item">
+                            <div class="param-header">
+                                <label>Params</label>
+                                <div class="param-actions">
+                                    <button class="copy-btn" id="sendParamsBtn" title="Send Params to Workflow">
+                                        <i class="fas fa-paper-plane"></i>
+                                    </button>
+                                </div>
+                            </div>
+                            <div class="other-params" id="recipeOtherParams"></div>
+                        </div>
                     </div>
                 </div>
             </div>