fusion_plating: change icon from Char to Selection dropdown (v19.0.2.0.5)

Icon field is now a selection with 24 curated plating icons. Users pick
from a dropdown with descriptive labels (e.g. "Fire / Bake", "Diamond /
Plating") instead of typing FA class codes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

fusion-plating/fusion_plating/models/fp_process_node.py

@@ -104,10 +104,35 @@ class FpProcessNode(models.Model):
         string='Internal Notes',
         help='Internal notes (not shown to customers).',
     )
-    icon = fields.Char(
+    icon = fields.Selection(
+        [
+            ('fa-flask', 'Flask / Chemistry'),
+            ('fa-industry', 'Industry / Line'),
+            ('fa-sitemap', 'Sitemap / Process'),
+            ('fa-wrench', 'Wrench / Operation'),
+            ('fa-cog', 'Gear / General'),
+            ('fa-cogs', 'Gears / System'),
+            ('fa-paint-brush', 'Paint / Masking'),
+            ('fa-eraser', 'Eraser / De-Masking'),
+            ('fa-th', 'Grid / Racking'),
+            ('fa-fire', 'Fire / Bake'),
+            ('fa-bolt', 'Bolt / Electric'),
+            ('fa-diamond', 'Diamond / Plating'),
+            ('fa-tint', 'Tint / Rinse'),
+            ('fa-shower', 'Shower / Clean'),
+            ('fa-bullseye', 'Target / Blast'),
+            ('fa-search', 'Search / Inspect'),
+            ('fa-check-circle', 'Check / Approve'),
+            ('fa-clock-o', 'Clock / Wait'),
+            ('fa-sun-o', 'Sun / Dry'),
+            ('fa-thermometer-half', 'Temp / Heat'),
+            ('fa-eye', 'Eye / Visual'),
+            ('fa-hand-paper-o', 'Hand / Manual'),
+            ('fa-cube', 'Cube / Part'),
+            ('fa-shield', 'Shield / Protect'),
+        ],
         string='Icon',
         default='fa-cog',
-        help='Font Awesome icon class.',
     )
     color = fields.Integer(
         string='Colour',