feat(demo): ISC browser runtime — 289 compact .isc maps + catalogue generator

Ship the ISC source format as the browser runtime's map store (7.8MB
vs 602MB of expanded JSON IR) and switch the transliteration worker to
iscStrategy over /maps. Regenerate maps-catalogue.json from the .isc
sources via scripts/generate-catalogue.mjs (adds alalc-fas-Arab-Latn-
1997). Known pre-existing failure on this branch, unrelated to this
change: maps-integration any_char_class guard (bundled JSONs predate
the JsonIR fix; superseded by the ISC path).

Author: ronaldtse

package-lock.json

@@ -17,7 +17,8 @@
     "format": "prettier --write .",
     "format:check": "prettier --check .",
     "test:e2e": "playwright test",
-    "test:e2e:ui": "playwright test --ui"
+    "test:e2e:ui": "playwright test --ui",
+    "generate:catalogue": "tsx scripts/generate-catalogue.mjs"
   },
   "dependencies": {
     "@asciidoctor/core": "^4.0.6",
@@ -50,6 +51,7 @@
     "playwright": "^1.62.1",
     "prettier": "^3.9.0",
     "prettier-plugin-astro": "^0.14.0",
+    "tsx": "^4.23.7",
     "typescript": "^5.6.0",
     "vitest": "^4.1.10"
   }