feat: NEW chip on source cards with unseen releases

Adds a per-source new-item badge to the source list in the Download
Components tab.  Each source card with at least one new fingerprint
(latest item changed since last visit) shows a small "NEW" chip in
primaryContainer colour to the right of the source name.

RemoteSourceRepository.getNewSourceNames() derives the set of source
names from the fingerprint diff; DownloadScreen captures it once with
remember{} when the tab is opened — so the chips are visible while
the user browses and gone on the next visit (markAllAsSeen already
ran on tab entry via LaunchedEffect in MainActivity).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: The412Banner

app/src/main/java/com/banner/inject/data/RemoteSourceRepository.kt

@@ -1164,6 +1164,19 @@ class RemoteSourceRepository(private val context: Context) {
         return result
     }
 
+    /**
+     * Returns the set of source names that have at least one new fingerprint
+     * compared to the saved snapshot.  Empty set if no snapshot exists yet.
+     */
+    fun getNewSourceNames(): Set<String> {
+        val seen = loadSeenFingerprints()
+        if (seen.isEmpty()) return emptySet()
+        return currentFingerprints()
+            .filter { it !in seen }
+            .mapNotNull { fp -> fp.split("::").firstOrNull() }
+            .toSet()
+    }
+
     /**
      * Returns true when the current cache contains items not present in the last
      * saved snapshot.  On first run (no saved snapshot) establishes a baseline

app/src/main/java/com/banner/inject/ui/screens/DownloadScreen.kt

@@ -89,6 +89,8 @@ fun DownloadScreen(
     var detailTarget by remember { mutableStateOf<Pair<RemoteSourceRepository.RemoteItem, String>?>(null) }
     var searchQuery by remember { mutableStateOf("") }
     var isSearchCaching by remember { mutableStateOf(false) }
+    // Captured once on composition — which source names had new items when the tab was opened
+    val newSourceNames = remember { repo.getNewSourceNames() }
 
     val componentTypes = listOf("dxvk", "vkd3d", "box64", "fexcore", "wined3d", RemoteSourceRepository.GPU_DRIVER_TYPE, "drivers", "wine", "proton")
 
@@ -461,6 +463,21 @@ fun DownloadScreen(
                                         color = MaterialTheme.colorScheme.onSurface,
                                         modifier = Modifier.weight(1f)
                                     )
+                                    if (source.name in newSourceNames) {
+                                        Spacer(Modifier.width(6.dp))
+                                        Surface(
+                                            color = MaterialTheme.colorScheme.primaryContainer,
+                                            shape = MaterialTheme.shapes.extraSmall
+                                        ) {
+                                            Text(
+                                                "NEW",
+                                                fontSize = 9.sp,
+                                                fontWeight = FontWeight.Bold,
+                                                color = MaterialTheme.colorScheme.onPrimaryContainer,
+                                                modifier = Modifier.padding(horizontal = 4.dp, vertical = 2.dp)
+                                            )
+                                        }
+                                    }
                                     Box {
                                         IconButton(
                                             onClick = { sourceMenuExpanded = source },