Improved home page support for Live TV & Recordings (#890)

## Description
Improves home page customization for Live TV & Recordings
- Add row for live tv channels
- Add row for "on now" programs
- Clicking on a TV channel or TV program starts playback
- Better name for "Recently recorded" instead of "Recently added in
Recordings"

Also fixes a back stack issue after adding rows

### Related issues
Follow up from #803 

### Testing
Emulator

## Screenshots
<img width="663" height="190" alt="image"
src="https://github.com/user-attachments/assets/49d41953-42ab-4621-92f1-b7936aab7e97"
/>

## AI or LLM usage
None

app/src/test/java/com/github/damontecres/wholphin/test/TestHomeRowSamples.kt

@@ -74,6 +74,7 @@ class TestHomeRowSamples {
                 HomeRowConfig.Favorite(kind = BaseItemKind.SERIES),
                 HomeRowConfig.Recordings(),
                 HomeRowConfig.TvPrograms(),
+                HomeRowConfig.TvChannels(),
                 HomeRowConfig.Suggestions(parentId = UUID.randomUUID()),
             )
     }
@@ -96,6 +97,7 @@ class TestHomeRowSamples {
                 is HomeRowConfig.Recordings -> foundTypes.add(it::class)
                 is HomeRowConfig.TvPrograms -> foundTypes.add(it::class)
                 is HomeRowConfig.Suggestions -> foundTypes.add(it::class)
+                is HomeRowConfig.TvChannels -> foundTypes.add(it::class)
             }
         }
         Assert.assertEquals(HomeRowConfig::class.sealedSubclasses.size, foundTypes.size)