A more vivid orange for the logo's needle (#59)

The needle was #f7931e (#ff9f2e dark), a soft orange close enough in
lightness to the tallest blue bar that the two ran together where they
touch, and weak at favicon size. It is now #ff5500 (#ff6a1a on the dark
background), fully saturated and pushed towards red, away from the bars'
blue. favicon.png and apple-touch-icon.png are re-rendered from logo.svg.

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

web/logo-dark.svg

@@ -15,5 +15,5 @@
     <rect x="624" y="280" width="112" height="544" rx="56" opacity=".85"/>
     <rect x="792" y="600" width="112" height="224" rx="56" opacity=".5"/>
   </g>
-  <g id="needle"><rect x="728" y="160" width="72" height="704" rx="36" fill="#ff9f2e"/></g>
+  <g id="needle"><rect x="728" y="160" width="72" height="704" rx="36" fill="#ff6a1a"/></g>
 </svg>