fix(appearance): scale inline px font sizes so text-size reaches all content

The global text-size control only set the root font-size, which scales rem-based text (navbar, menus) but not the dense inline px sizes used across the trip planner, budget, journey and panels — so place titles and addresses stayed fixed. applyAppearance now also exposes the factor as --fs-scale-text, and a codemod wraps inline numeric fontSize in calc(<px> * var(--fs-scale-text, 1)) across components and pages (map popups and PDF excluded). Sizes are byte-identical at 100%; the control now visibly resizes the actual content.

client/public/theme-boot.js

@@ -48,6 +48,7 @@
     setScale('--fs-scale-caption', ts.caption);
     if (typeof s.fontScale === 'number' && s.fontScale !== 1) {
       root.style.fontSize = s.fontScale * 100 + '%';
+      root.style.setProperty('--fs-scale-text', String(s.fontScale));
     }
 
     function setScale(name, v) {