fix(quick-look): dark-mode-aware instructions panel

The Operator Instructions panel had a hardcoded inline style
(background: #f8f9fa) which became a white-on-dark unreadable blob
in dark mode. Replaced with a CSS class backed by an SCSS file that
branches at compile-time via $o-webclient-color-scheme — registered
in both web.assets_backend (light) and web.assets_web_dark (dark)
bundles per the CLAUDE.md pattern.

Tokens: panel bg #f8f9fa light / #22262d dark; border #d8dadd /
#3a3f47; text #212529 / #e8eaed.

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

fusion_plating/fusion_plating_jobs/models/fp_job_step.py

@@ -933,3 +933,25 @@ class FpJobStep(models.Model):
             'target': 'current',
             'name': self.name,
         }
+
+    def action_open_quick_look(self):
+        """Open the read-only Step Details quick-look modal.
+
+        Bound to the row-button on the embedded step list — explicit
+        trigger needed because editable="bottom" intercepts row clicks
+        for inline editing rather than opening the form view.
+        """
+        self.ensure_one()
+        view = self.env.ref(
+            'fusion_plating_jobs.view_fp_job_step_quick_look_form'
+        )
+        return {
+            'type': 'ir.actions.act_window',
+            'res_model': 'fp.job.step',
+            'res_id': self.id,
+            'view_mode': 'form',
+            'view_id': view.id,
+            'views': [(view.id, 'form')],
+            'target': 'new',
+            'name': self.name,
+        }