Optional app PIN, settings header, pink selection ring

- A PIN (4 to 8 digits, salted SHA-256 in prefs) set in Settings shows
  a logo splash with a PIN prompt at start and whenever the app returns
  after leaving the screen; Back there leaves the app.
- Settings gets the back-arrow header shared with the folder grid
  (Ui.header) and scrolls, since the PIN fields overflow the screen.
- Tile and list focus rings use the icon pink.

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

1 files changed, 1 insertions, 11 deletions

diff --git a/app/src/main/java/mygram/droid/FolderActivity.java b/app/src/main/java/mygram/droid/FolderActivity.java
index dd674c4..65ac596 100644
--- a/app/src/main/java/mygram/droid/FolderActivity.java
+++ b/app/src/main/java/mygram/droid/FolderActivity.java
@@ -19,11 +19,9 @@ 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;
-import android.widget.TextView;
 import android.widget.Toast;
 
 import androidx.recyclerview.widget.GridLayoutManager;
@@ -52,15 +50,7 @@ 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(p, 0, 0, 0);
-		header.addView(title);
-		column.addView(header);
+		column.addView(Ui.header(this, getIntent().getStringExtra("name")));
 		content = new FrameLayout(this);
 		column.addView(content, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 0, 1));
 		setContentView(column);