test(theme-studio): extract app-core.js and unit-test the app logic

The refactor's goal was to make the app logic testable; this realizes it. Pulled the pure package-face model and the dropdown option list into app-core.js — nameToHex, buildPkgmap, packagesForExport, mergePackagesInto, effResolve (the inherit-chain resolver behind pkgEffFg/pkgEffBg), and optList — with every dependency passed as a parameter so there is no DOM and no module-global reliance. generate.py inlines it into the page the same way it inlines colormath.js (strip exports, placeholder, integrity check), so the browser runs the same code the tests import.

app.js keeps thin wrappers (pname, seedPkgmap, ddList, pkgEffFg, pkgEffBg) that pass the live PALETTE / APPS / PKGMAP into the core, so no call site changed and the built DOM is byte-identical to before.

test-app-core.mjs adds 18 Normal/Boundary/Error tests over the extracted logic — name resolution, the seed/export/merge round trip, the inherit chain including a cycle that must terminate at null, and the "(gone)" dropdown entry — plus an inline-integrity check that the page carries the core verbatim. The node suite goes 25 to 43 tests; python templating gains the app-core integrity assertion.

1 files changed, 4 insertions, 0 deletions

diff --git a/scripts/theme-studio/generate.py b/scripts/theme-studio/generate.py
index 0b23bc69..e2a26f82 100644
--- a/scripts/theme-studio/generate.py
+++ b/scripts/theme-studio/generate.py
@@ -22,6 +22,9 @@ COLORMATH_BODY=strip_exports(open(os.path.join(HERE,'colormath.js')).read())
 # (MAP_J, PALETTE_J, COLORMATH_J, ...); those are filled after it is spliced in.
 STYLES=open(os.path.join(HERE,'styles.css')).read()
 APP_BODY=open(os.path.join(HERE,'app.js')).read()
+# Pure package-model + dropdown logic, inlined into the page (and unit-tested via
+# test-app-core.mjs) the same way colormath.js is.
+APP_CORE_BODY=strip_exports(open(os.path.join(HERE,'app-core.js')).read())
 ns={}
 src=open(os.path.join(HERE,'samples.py')).read()
 exec(src[:src.index('cols=')], ns)
@@ -502,6 +505,7 @@ APP_JS</script>"""
 # the triple-quoted string used to cause is gone now that app.js is a real file.
 def fill_data(s):
     return (s.replace("COLORMATH_J",COLORMATH_BODY)
+     .replace("APP_CORE_J",APP_CORE_BODY)
      .replace("SAMPLES_J",json.dumps(SAMPLES))
      .replace("PALETTE_J",json.dumps(PALETTE)).replace("CATS_J",json.dumps(CATS))
      .replace("UIFACES_J",json.dumps(UI_FACES)).replace("UIMAP_J",json.dumps(UIMAP)).replace("APPS_J",json.dumps(APPS))