Back icon in folder view, softer focus, Back returns to Home

From on-device testing: the folder grid had no visible way back, the
white focus ring on icons was harsh, and Back on the Liked or Folders
tab closed the app. Icon buttons now get a soft rounded highlight,
tiles a thinner translucent ring, and Back leaves the app only from
Home.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

3 files changed, 20 insertions, 3 deletions

diff --git a/app/src/main/java/mygram/droid/FolderActivity.java b/app/src/main/java/mygram/droid/FolderActivity.java
index c7002c5..dd674c4 100644
--- a/app/src/main/java/mygram/droid/FolderActivity.java
+++ b/app/src/main/java/mygram/droid/FolderActivity.java
@@ -19,6 +19,7 @@ import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
+import android.view.Gravity;
 import android.view.ViewGroup;
 import android.widget.FrameLayout;
 import android.widget.LinearLayout;
@@ -51,9 +52,15 @@ public final class FolderActivity extends Activity {
 		super.onCreate(state);
 		LinearLayout column = new LinearLayout(this);
 		column.setOrientation(LinearLayout.VERTICAL);
+		LinearLayout header = new LinearLayout(this);
+		header.setGravity(Gravity.CENTER_VERTICAL);
+		int p = Ui.dp(this, 16);
+		header.setPadding(p * 2, p, p * 2, 0);
+		header.addView(Ui.iconButton(this, R.drawable.ic_arrow_back, "Back", v -> finish()));
 		TextView title = Ui.text(this, getIntent().getStringExtra("name"), 24);
-		title.setPadding(Ui.dp(this, 36), Ui.dp(this, 24), 0, 0);
-		column.addView(title);
+		title.setPadding(p, 0, 0, 0);
+		header.addView(title);
+		column.addView(header);
 		content = new FrameLayout(this);
 		column.addView(content, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 0, 1));
 		setContentView(column);
diff --git a/app/src/main/java/mygram/droid/MainActivity.java b/app/src/main/java/mygram/droid/MainActivity.java
index 3292f90..7c29e0a 100644
--- a/app/src/main/java/mygram/droid/MainActivity.java
+++ b/app/src/main/java/mygram/droid/MainActivity.java
@@ -220,6 +220,16 @@ public final class MainActivity extends Activity {
 		handler.removeCallbacks(rotate);
 	}
 
+	/** Back from Liked or Folders returns to Home; from Home it leaves the app. */
+	@Override
+	@SuppressWarnings("deprecation") // no predictive back on this TV; onBackPressed still fires
+	public void onBackPressed() {
+		if (ready && tab != HOME)
+			show(HOME);
+		else
+			super.onBackPressed();
+	}
+
 	@Override
 	protected void onDestroy() {
 		handler.removeCallbacks(rotate);
diff --git a/app/src/main/java/mygram/droid/Ui.java b/app/src/main/java/mygram/droid/Ui.java
index 65de7f8..586aa65 100644
--- a/app/src/main/java/mygram/droid/Ui.java
+++ b/app/src/main/java/mygram/droid/Ui.java
@@ -113,7 +113,7 @@ final class Ui {
 		t.setVisibility(View.INVISIBLE);
 		box.addView(t);
 		box.setFocusable(true);
-		box.setForeground(c.getDrawable(R.drawable.focus_ring));
+		box.setBackground(c.getDrawable(R.drawable.focus_glow));
 		box.setOnFocusChangeListener((v, has) -> {
 			t.setVisibility(has ? View.VISIBLE : View.INVISIBLE);
 			zoom(v, has);