webui v172: the photo viewer buttons keep their elevation while pressed

The !important sweep left .photo-view-nav-btn (0,1,0) losing its own
box-shadow to the global button:active inset (0,1,1) during the press;
its elevation is now restated on :active. Label to v172.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

webui-src/app/main.js

@@ -2,7 +2,7 @@ const m = require('mithril');
 
 //  Bumped at every change of the web UI; shown in the rail, the phone header
 //  and the Debug page.
-const WEBUI_VERSION = 'v171';
+const WEBUI_VERSION = 'v172';
 
 const login = require('login');
 const rs = require('rswebui');

webui-src/app/scss/pages/_board.scss

@@ -962,6 +962,12 @@ button.board-card__vote-btn,
   color: #ffffff;
 }
 
+// The global button:active (0,1,1) presses an inset shadow over this class
+// (0,1,0) while clicked; keep the button's own elevation instead.
+.photo-view-nav-btn:active {
+  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
+}
+
 .photo-view-footer {
   display: flex;
   align-items: center;