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/static/src/scss/fp_step_quick_look.scss

@@ -0,0 +1,41 @@
+// Step Details Quick-Look modal — dark-mode aware tokens.
+// Pattern documented in fusion-plating/CLAUDE.md: branch hex values
+// at SCSS compile-time via $o-webclient-color-scheme. Don't rely on
+// var(--bs-body-bg) — Odoo 19 doesn't flip it consistently across
+// addons.
+
+$o-webclient-color-scheme: bright !default;
+
+$_fp_ql_panel_hex:  #f8f9fa;
+$_fp_ql_border_hex: #d8dadd;
+$_fp_ql_text_hex:   #212529;
+
+@if $o-webclient-color-scheme == dark {
+    $_fp_ql_panel_hex:  #22262d !global;
+    $_fp_ql_border_hex: #3a3f47 !global;
+    $_fp_ql_text_hex:   #e8eaed !global;
+}
+
+$fp-ql-panel:  var(--fp-card-bg, #{$_fp_ql_panel_hex});
+$fp-ql-border: var(--fp-border-color, #{$_fp_ql_border_hex});
+$fp-ql-text:   var(--fp-text, #{$_fp_ql_text_hex});
+
+// Container around the rich-text instructions inside the quick-look
+// modal. Bordered + scrollable + readable in both light and dark modes.
+.o_fp_quick_look_instructions {
+    max-height: 40vh;
+    overflow: auto;
+    padding: 12px 14px;
+    margin-bottom: 8px;
+    background: $fp-ql-panel;
+    color: $fp-ql-text;
+    border: 1px solid $fp-ql-border;
+    border-radius: 4px;
+
+    // Make sure rich-text inner elements inherit the readable colour.
+    p, li, span, strong, em, h1, h2, h3, h4, h5, h6 {
+        color: inherit;
+    }
+    ul, ol { margin-bottom: 0; }
+    p:last-child { margin-bottom: 0; }
+}