SEV-392: reusable fuzzy combobox component (+fuzzysort) v0.4.0

comboboxData(config) Alpine factory: typeable input + fuzzysort-ranked
dropdown (prefix/substring/abbreviation subsequence matching), keyboard
nav (Arrow/Enter/Escape/Tab), a11y roles, x-modelable value binding.
allowFree (default) accepts off-list typed values so classics/kit cars are
never blocked; allowFree:false for closed lists (US states) snaps back to a
valid option on blur. Foundation for replacing native <select> chrome with
inputs that match our text fields. 17/17 tests pass.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

package.json

@@ -1,13 +1,14 @@
 {
   "name": "@switchev/web-shared",
-  "version": "0.3.0",
-  "description": "Shared browser helpers (formatters, markdown, image polling) for the SwitchEV frontends",
+  "version": "0.4.0",
+  "description": "Shared browser helpers (formatters, markdown, image polling, combobox) for the SwitchEV frontends",
   "type": "module",
   "exports": {
     ".": "./src/index.js",
     "./format": "./src/format.js",
     "./markdown": "./src/markdown.js",
-    "./wait-image": "./src/wait-image.js"
+    "./wait-image": "./src/wait-image.js",
+    "./combobox": "./src/combobox.js"
   },
   "files": [
     "src"
@@ -15,6 +16,9 @@
   "sideEffects": [
     "./src/markdown.js"
   ],
+  "dependencies": {
+    "fuzzysort": "^3.1.0"
+  },
   "peerDependencies": {
     "dompurify": ">=3",
     "marked": ">=12"