Prioritize external transcription endpoint over browser Web Speech API

Previously the on-device Web Speech API (Chrome/Edge/Safari) was always
preferred, and the configured external transcription endpoint was only
used as a fallback when the browser had no speech API at all (Firefox).

Flip the priority in Composer.tsx: if a transcription endpoint is
configured in Settings, use it for dictation regardless of browser
support, since it's generally far more accurate. Fall back to the
browser's on-device SpeechRecognition only when no endpoint is set.

Update the Settings hint text and README to describe the new behavior.
Rebuilt and redeployed to the repo root.

sw.js

@@ -1 +1 @@
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+if(!self.define){let e,i={};const n=(n,s)=>(n=new URL(n+".js",s).href,i[n]||new Promise(i=>{if("document"in self){const e=document.createElement("script");e.src=n,e.onload=i,document.head.appendChild(e)}else e=n,importScripts(n),i()}).then(()=>{let e=i[n];if(!e)throw new Error(`Module ${n} didn’t register its module`);return e}));self.define=(s,o)=>{const r=e||("document"in self?document.currentScript.src:"")||location.href;if(i[r])return;let c={};const l=e=>n(e,r),t={module:{uri:r},exports:c,require:l};i[r]=Promise.all(s.map(e=>t[e]||l(e))).then(e=>(o(...e),c))}}define(["./workbox-abeb32eb"],function(e){"use strict";self.skipWaiting(),e.clientsClaim(),e.precacheAndRoute([{url:"index.html",revision:"84ac5ebbe2382c8ec70814e7f406d21e"},{url:"assets/workbox-window.prod.es5-BqEJf4Xk.js",revision:null},{url:"assets/index-SBr79e_P.js",revision:null},{url:"assets/index-CWSassUi.css",revision:null},{url:"favicon.svg",revision:"a3baf2b041a9ed1fcc08d8a3634b535b"},{url:"icons/apple-touch-icon.png",revision:"ed81749f391ac07000b948263124e943"},{url:"icons/icon-192.png",revision:"8b2374bbaec1e3d1db8a07af64a6ef77"},{url:"icons/icon-512.png",revision:"c44a8f2da9095157b9b9aff7ec8e1aeb"},{url:"icons/maskable-512.png",revision:"beb4196443dc6daafcaab4497038613d"},{url:"manifest.webmanifest",revision:"d1afe01b7c52b0c511fd7e5f11079c23"}],{}),e.cleanupOutdatedCaches(),e.registerRoute(new e.NavigationRoute(e.createHandlerBoundToURL("index.html"),{denylist:[/^\/api\//]})),e.registerRoute(({url:e})=>e.pathname.startsWith("/api/"),new e.NetworkOnly,"GET")});