fix(appearance): clearer widget settings, density hint, solid surfaces with transparency off

Dashboard widget settings are grouped by where they sit on the dashboard (below the hero / right sidebar / bottom of page); the right-sidebar master toggle now nests its individual widgets and greys them out when the sidebar is off, instead of a confusing flat list mixing the master with its children. Density gains an explanatory hint plus a real compact spacing effect. Transparency-off also solidifies the Atlas glass panels and tooltip, Leaflet zoom controls and GL popups — class-based surfaces via CSS, the Atlas inline panels via a noTransparency flag.

shared/src/i18n/de/settings.ts

@@ -388,6 +388,10 @@ const settings: TranslationStrings = {
   'settings.appearance.widget.daysTraveled': 'Reisetage',
   'settings.appearance.widget.distanceFlown': 'Flugdistanz',
   'settings.appearance.reset': 'Auf Standard zurücksetzen',
+  'settings.appearance.group.belowHero': 'Unter dem Hero',
+  'settings.appearance.group.bottomOfPage': 'Seitenende',
+  'settings.appearance.sidebarHint': 'Die ganze rechte Spalte. Aus → das Dashboard zentriert sich.',
+  'settings.appearance.densityHint': 'Kompakt verringert Abstände und Innenabstände für ein dichteres Layout.',
 };
 
 export default settings;

shared/src/i18n/en/settings.ts

@@ -382,6 +382,10 @@ const settings: TranslationStrings = {
   'settings.appearance.widget.daysTraveled': 'Days traveled',
   'settings.appearance.widget.distanceFlown': 'Distance flown',
   'settings.appearance.reset': 'Reset to defaults',
+  'settings.appearance.group.belowHero': 'Below the hero',
+  'settings.appearance.group.bottomOfPage': 'Bottom of page',
+  'settings.appearance.sidebarHint': 'The whole right column. Turn off and the dashboard centers.',
+  'settings.appearance.densityHint': 'Compact tightens spacing and padding for a denser layout that fits more on screen.',
 };
 
 export default settings;