style: capitalize "Relicario" in prose / UI / CLI help

Brand name uses capital R in user-facing text — extension UI strings,
CLI clap help / descriptions / error prose, markdown docs. Lowercase
preserved for the binary command, crate names, npm package, file
paths, env vars, and code identifiers.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

extension/src/popup/components/unlock.ts

@@ -9,7 +9,7 @@ export function renderUnlock(app: HTMLElement): void {
   app.innerHTML = `
     <div class="pad" style="text-align:center; padding-top:40px;">
       <img class="brand-logo" src="icons/relicario-logo.svg" alt="">
-      <div class="brand">relicario</div>
+      <div class="brand">Relicario</div>
       <p class="muted" style="margin:8px 0 24px;">two-factor vault</p>
       <div class="form-group">
         <input