A logo drawn from the radio's screen, to app icon guidelines (#55)

The 2004 icon is a whole radio on a transparent background and not
square, so the tab icon was padded and iOS painted the home-screen icon
on white. web/logo.svg is the radio's screen alone, its tuning scale and
orange needle, laid out as Apple's app icon guidelines ask: opaque and
full-bleed (the system cuts its own corners), a gradient background and
flat foreground layers with hard edges, no highlights or shadows of its
own, nothing thin enough to vanish at 32px. Each layer is a <g>, ready to
split out for Icon Composer. web/logo-dark.svg is the same layers
recoloured.

favicon.png (128) and apple-touch-icon.png (180) are renders of it. The
pages show it from /logo.svg, served outside the auth layer for the
sign-in page, with an app icon's rounded corners. The 2004 icon stays at
/icon.png for anything outside that links to it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/admin.html

@@ -13,7 +13,7 @@
 <!-- The server sends this page, and its script, to admins only. -->
 <header id="topbar">
   <a class="btn ico" href="/" title="Back to iPodderX" aria-label="Back to iPodderX" data-icon="left"></a>
-  <img class="logo" src="/icon.png" alt="" width="26">
+  <img class="logo" src="/logo.svg" alt="" width="26">
   <h1>Admin</h1>
   <span class="grow"></span>
   <nav class="tabs" id="atabs">