fix(simple-editor): sticky Step Library panel for long recipes

Reported 2026-05-20: on a 40+ step recipe (e.g. ENP-STEEL-BASIC),
scrolling down into the Selected steps pane scrolled the Step
Library off the top of the screen. Authors had to scroll back up
to grab a step, then scroll down to drop it.

Fix: position: sticky on .o_fp_library_panel, pinned to top: 1rem
(matches the editor's padding) inside the .o_fp_simple_editor
overflow container. align-items: start on the grid so the library
column doesn't stretch to match the recipe column's height
(prerequisite for sticky to behave).

The library itself can have 30+ entries (curated step kinds +
shop-defined library templates). max-height: calc(100vh - 8rem)
+ overflow-y: auto keeps it from blowing past the viewport — it
grows its own internal scrollbar instead.

Mobile (≤900px) reverts to static positioning so the stacked
layout stays sensible.

Module: fusion_plating 19.0.20.6.1 → 19.0.20.6.2.

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

fusion_plating/fusion_plating/__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating',
-    'version': '19.0.20.6.1',
+    'version': '19.0.20.6.2',
     'category': 'Manufacturing/Plating',
     'summary': 'Core plating / metal finishing ERP: facilities, processes, tanks, baths, jobs, operators.',
     'description': """

fusion_plating/fusion_plating/static/src/scss/simple_recipe_editor.scss

@@ -116,6 +116,10 @@ $fp-se-drop:   var(--fp-drop-bg, #{$_fp_se_drop_hex});
         display: grid;
         grid-template-columns: 2fr 1fr;
         gap: 1rem;
+        // align-items: start so the library panel can be shorter than
+        // the recipe-step column without stretching to match its height
+        // — required for sticky positioning to behave.
+        align-items: start;
 
         @media (max-width: 900px) {
             grid-template-columns: 1fr;
@@ -137,6 +141,33 @@ $fp-se-drop:   var(--fp-drop-bg, #{$_fp_se_drop_hex});
     }
 }
 
+// Step Library — pin to the top of the scroll container so authors
+// can drag from it into the recipe without scrolling back up.
+// Recipes can be 40+ steps long; before this, the library scrolled
+// off with the page and you had to scroll to the top, grab a step,
+// scroll back down, drop. Bug reported 2026-05-20.
+//
+// Sticky inside the editor's overflow:auto container. max-height +
+// internal overflow-y so the library's OWN content (could be 30+
+// entries) doesn't blow past the viewport — it grows a scrollbar
+// instead.
+.o_fp_library_panel {
+    position: sticky;
+    top: 1rem;                // matches the editor's padding
+    max-height: calc(100vh - 8rem);  // leave room for headers + footer
+    overflow-y: auto;
+    // Keep a faint shadow on the sticky edge so it reads as a
+    // floating sidebar, not glued onto the recipe column.
+    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
+
+    @media (max-width: 900px) {
+        // Stacked layout — no sticky, behaves like a normal block.
+        position: static;
+        max-height: none;
+        box-shadow: none;
+    }
+}
+
 // ===================================================== Drop simulator
 //
 // Thin reservation line between rows that activates only when the