Text size setting for path bar + file list (Compact/Default/Large)

Segmented row in the options popover; applied via data-text on <html> driving
CSS variables (--list-font / --list-meta-font / --path-font), persisted in
settings.json like theme and speed unit.

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

ui/src/styles.css

@@ -100,6 +100,23 @@
   --radius-lg: var(--radius);
 }
 
+/* Text-size setting for the path bar + file list (data-text set by SettingsService). */
+:root {
+  --list-font: 13px;
+  --list-meta-font: 12px;
+  --path-font: 12px;
+}
+:root[data-text='compact'] {
+  --list-font: 12px;
+  --list-meta-font: 11px;
+  --path-font: 11px;
+}
+:root[data-text='large'] {
+  --list-font: 14px;
+  --list-meta-font: 13px;
+  --path-font: 13px;
+}
+
 html,
 body {
   height: 100%;