Sorts previews.json output by lookup_path for stable order

Lookbook.previews follows filesystem glob order, which differs
between macOS and Linux whenever two previews share a name across
statuses (e.g. beta/heading and open_project/heading). Every
upstream sync regenerated on macOS was getting immediately
followed by a CI "Generating static files" autocommit reordering
the same two entries back to Linux's order.

Sorting explicitly by lookup_path removes the platform dependency,
so local and CI regeneration produce the same file.

Author: myabc

.changeset/deterministic-previews-order.md

@@ -0,0 +1,5 @@
+---
+"@openproject/primer-view-components": patch
+---
+
+Sort `static/previews.json` entries by `lookup_path` so the output order is deterministic across platforms, instead of following `Lookbook.previews`' filesystem glob order (which differs between macOS and Linux for previews sharing the same name across statuses, e.g. `beta/heading` and `open_project/heading`).

lib/primer/static/generate_previews.rb

@@ -10,7 +10,7 @@ module Static
     module GeneratePreviews
       class << self
         def call
-          Lookbook.previews.filter_map do |preview|
+          Lookbook.previews.sort_by(&:lookup_path).filter_map do |preview|
             next if preview.preview_class == Primer::FormsPreview
             next if Primer::Accessibility.ignore_preview?(preview.preview_class)