feat: show full path bar in file browser (#1411)

![obraz](https://github.com/user-attachments/assets/f848a381-7c45-4724-912b-56168791bcf3)


## Summary

Adds a full path display at the bottom of the file browser with a
separator line matching the header style. Path uses the small font,
left-truncates to always show the deepest folder when path is too long.
Toggleable via Settings > System > Show Full Path (default on).

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**< PARTIALLY >**_

---------

Co-authored-by: Patryk Radtke <patryk@Patryks-MacBook-Pro.local>

src/components/UITheme.cpp

@@ -49,7 +49,7 @@ void UITheme::setTheme(CrossPointSettings::UI_THEME type) {
 }
 
 int UITheme::getNumberOfItemsPerPage(const GfxRenderer& renderer, bool hasHeader, bool hasTabBar, bool hasButtonHints,
-                                     bool hasSubtitle) {
+                                     bool hasSubtitle, int extraReservedHeight) {
   const ThemeMetrics& metrics = UITheme::getInstance().getMetrics();
   int reservedHeight = metrics.topPadding;
   if (hasHeader) {
@@ -61,7 +61,7 @@ int UITheme::getNumberOfItemsPerPage(const GfxRenderer& renderer, bool hasHeader
   if (hasButtonHints) {
     reservedHeight += metrics.verticalSpacing + metrics.buttonHintsHeight;
   }
-  const int availableHeight = renderer.getScreenHeight() - reservedHeight;
+  const int availableHeight = renderer.getScreenHeight() - reservedHeight - extraReservedHeight;
   int rowHeight = hasSubtitle ? metrics.listWithSubtitleRowHeight : metrics.listRowHeight;
   return availableHeight / rowHeight;
 }