Fix upload dialog re-trigger + add game size to detail page

- Fixed: navigating back to library no longer re-opens file dialog
  (prev-value guard in uploadTriggered effect)
- Added bundleSize field to Game, populated at load time from .jsdos file
- Game detail page shows file size next to DOS badge (e.g. 'DOS · 127 MB')

src/main/java/com/dostalgia/Game.java

@@ -23,6 +23,9 @@ public class Game {
 
     private String setupExe;    // relative path to SETUP.EXE (null if none)
 
+    /** Game bundle file size in bytes. Populated dynamically at load time (not persisted). */
+    private Long bundleSize;
+
     /** Currently selected main executable (relative path inside the bundle, e.g. "FALLOUT.EXE" or "FALLOUT/FALLOUT.EXE"). */
     private String executable;
 
@@ -91,6 +94,9 @@ public class Game {
     public String getSetupExe() { return setupExe; }
     public void setSetupExe(String setupExe) { this.setupExe = setupExe; }
 
+    public Long getBundleSize() { return bundleSize; }
+    public void setBundleSize(Long bundleSize) { this.bundleSize = bundleSize; }
+
     public String getExecutable() { return executable; }
     public void setExecutable(String executable) { this.executable = executable; }
 

src/main/java/com/dostalgia/GameService.java

@@ -67,8 +67,14 @@ public class GameService {
             Files.exists(gameDir(id).resolve("cover.png")) ||
             Files.exists(gameDir(id).resolve("cover.webp"))
         );
+        // Detect bundle size
+        try {
+            Path bundlePath = gamesDir.resolve(game.getBundleFile());
+            if (bundlePath != null && Files.exists(bundlePath)) {
+                game.setBundleSize(Files.size(bundlePath));
+            }
+        } catch (IOException ignored) {}
         return game;
-    }
 
     /** Save game metadata to disk. */
     public void save(Game game) throws IOException {