fix(configurator): centre Process Editor button icon + make icon white

- Icon + label now share an inline-flex row with align-items: center,
  so both sit on the button's vertical midline regardless of line-
  height inheritance.
- Dedicated gap (10px) replaces the me-2 utility so the _hint block's
  .fa { margin-bottom: 16px } can't bleed in and push the icon off.
- Icon colour forced to #ffffff to match the button's white label —
  contrast against btn-primary green is now clean.

fusion_plating_configurator → 19.0.12.3.0

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating_configurator/__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating — Configurator',
-    'version': '19.0.12.2.0',
+    'version': '19.0.12.3.0',
     'category': 'Manufacturing/Plating',
     'summary': 'Quotation configurator with part catalog, coating configs, and formula-based pricing engine.',
     'description': """

fusion_plating/fusion_plating_configurator/static/src/scss/fp_part_process_composer.scss

@@ -122,4 +122,26 @@ $fp-composer-muted:  var(--fp-composer-muted, $_fp-composer-muted-hex);
             color: $fp-composer-muted;
         }
     }
+
+    // "Open Process Editor" button — icon + label vertically centred,
+    // icon forced to a dark tone for high contrast against the primary
+    // button's green fill (the default inherited colour was washed out).
+    &_editor_btn {
+        display: inline-flex;
+        align-items: center;
+        justify-content: center;
+        gap: 10px;
+        padding: 10px 20px;
+        line-height: 1;
+
+        .fa {
+            color: #ffffff;           // white — matches the button label for a clean read
+            font-size: 1.05em;
+            margin: 0;                // override the _hint/_empty 16px bottom margin
+        }
+
+        span {
+            line-height: 1;
+        }
+    }
 }

fusion_plating/fusion_plating_configurator/static/src/xml/fp_part_process_composer.xml

@@ -66,9 +66,9 @@
                             <p>This part has a composed process tree. Click below to open the
                             full tree editor where you can add, remove, reorder, and configure
                             the process nodes.</p>
-                            <button class="btn btn-primary"
+                            <button class="btn btn-primary o_fp_part_composer_editor_btn"
                                     t-on-click="() => this.openRecipeEditor()">
-                                <i class="fa fa-sitemap me-2"/>
+                                <i class="fa fa-sitemap"/>
                                 <span>Open Process Editor</span>
                             </button>
                         </div>