fix(web-installer): use simple white logo via CSS filter instead of heavy contouring SVG

brightness(0) invert(1) turns logo-tigertag.svg (11 KB) pure white.
Drops logo_tigertag_contouring-dark.svg (451 KB) from page load.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: BenGlut

web-installer/index.html

@@ -171,6 +171,7 @@
         .hero-logo {
             display: block; width: 260px; height: auto; max-width: 75%;
             margin: 0 auto 20px;
+            filter: brightness(0) invert(1);
         }
         .hero-pill {
             display: inline-flex; align-items: center; gap: 6px;
@@ -410,7 +411,7 @@
     <div class="hero-orb hero-orb-2" aria-hidden="true"></div>
     <div class="hero-orb hero-orb-3" aria-hidden="true"></div>
 
-    <img src="img/logo_tigertag_contouring-dark.svg" alt="TigerTag" class="hero-logo" width="260" height="auto">
+    <img src="img/logo-tigertag.svg" alt="TigerTag" class="hero-logo" width="260" height="auto">
     <div class="hero-pill" data-i18n="pill" role="status">v2.2.0 · Open source</div>
     <h1 class="hero-title" data-i18n="heroTitle">TigerScale Web Installer</h1>
     <p class="hero-tagline" data-i18n-html="heroTagline">