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diff --git a/source/ui/CodeView.mc b/source/ui/CodeView.mc
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+// Author:  cirakg & claude ai
+// Summary: Shows a barcode entry: black modules on a white screen at the largest whole module size that fits, with text.
+//
+// README 12.2:
+//   * Always black on white (whatever the theme), quiet zone included.
+//   * Linear codes use the widest horizontal band: on round screens the
+//     band's narrower edge limits the width. The module size is the largest
+//     whole number of pixels that fits the code plus 10 quiet modules on
+//     each side; 1 px is allowed for linear codes (EAN-13 on 218 px screens
+//     needs it, and the screenshot decode test covers it).
+//   * Human-readable text under linear codes when enabled and there's room.
+//   * Brightness: the backlight is turned on when shown and on every tap.
+//   * Too big: a message with the size needed.
+// The payload is decrypted when the screen opens and wiped once encoded;
+// the module row stays in memory only while the screen is shown.
+
+import Toybox.Attention;
+import Toybox.Graphics;
+import Toybox.Lang;
+import Toybox.WatchUi;
+
+class CodeView extends WatchUi.View {
+
+    static const QUIET_MODULES = 10;
+    static const MIN_LINEAR_PX = 1;
+
+    var header as Entry;
+    private var _code as Codes.LinearCode or Codes.CodeError or Null = null;
+    private var _showText as Boolean = true;
+    private var _shownLogged as Boolean = false;
+
+    function initialize(entryHeader as Entry) {
+        View.initialize();
+        header = entryHeader;
+    }
+
+    function onShow() as Void {
+        _shownLogged = false;
+        encode();
+        boostBrightness();
+    }
+
+    function onHide() as Void {
+        _code = null;
+    }
+
+    private function encode() as Void {
+        try {
+            var entry = AppState.theVault().open(header.id);
+            var payload = Bytes.toUtf8(entry.payload as ByteArray);
+            _showText = (entry.options & Codes.OPT_SHOW_TEXT) != 0;
+            _code = payload != null ? Codes.encode(entry.type, payload, entry.options) : new Codes.CodeError("damaged text");
+            entry.wipeSecrets();
+        } catch (e instanceof VaultError) {
+            _code = new Codes.CodeError(e.code == VaultError.LOCKED ? "locked" : "damaged entry");
+        }
+    }
+
+    // Full backlight while a code is shown (AMOLED watches limit how long;
+    // the system then dims it, and a tap asks again).
+    function boostBrightness() as Void {
+        if (!AppState.options.fullBrightness || !(Attention has :backlight)) {
+            return;
+        }
+        try {
+            Attention.backlight(true);
+        } catch (e instanceof Lang.Exception) {
+            // BacklightOnTooLongException: the system's limit was reached.
+        }
+    }
+
+    function onUpdate(dc as Graphics.Dc) as Void {
+        var w = dc.getWidth();
+        var h = dc.getHeight();
+        dc.setColor(Graphics.COLOR_BLACK, Graphics.COLOR_WHITE);
+        dc.clear();
+        var smallFont = Graphics.FONT_XTINY;
+        var smallH = dc.getFontHeight(smallFont);
+        var code = _code;
+        if (code instanceof Codes.LinearCode) {
+            drawLinear(dc, code, smallFont, smallH);
+        } else {
+            var message = code instanceof Codes.CodeError ? code.message : "…";
+            var lines = Ui.wrap(dc, message, smallFont, 2 * Ui.halfWidthAt(dc, h / 2) - 16);
+            var y = h / 2 - lines.size() * smallH / 2;
+            for (var i = 0; i < lines.size(); i++) {
+                dc.drawText(w / 2, y, smallFont, lines[i], Graphics.TEXT_JUSTIFY_CENTER);
+                y += smallH;
+            }
+        }
+        // Name at the top and ID at the bottom, in small print.
+        var top = Ui.isRound() ? h / 8 : 4;
+        dc.setColor(Graphics.COLOR_DK_GRAY, Graphics.COLOR_TRANSPARENT);
+        dc.drawText(w / 2, top, smallFont, Ui.fit(dc, header.name, smallFont, 2 * Ui.halfWidthAt(dc, top + smallH)),
+            Graphics.TEXT_JUSTIFY_CENTER);
+        var bottom = Ui.isRound() ? h - h / 8 - smallH : h - smallH - 4;
+        dc.drawText(w / 2, bottom, smallFont, Codes.name(header.type) + " · " + header.id, Graphics.TEXT_JUSTIFY_CENTER);
+        if (!_shownLogged && code != null) {
+            _shownLogged = true;
+            Diag.shown(code instanceof Codes.LinearCode ? "code" : "code_error");
+        }
+    }
+
+    // The bars in the widest band that fits, with text below when enabled.
+    private function drawLinear(dc as Graphics.Dc, code as Codes.LinearCode, font as Graphics.FontType, fontH as Number) as Void {
+        var w = dc.getWidth();
+        var h = dc.getHeight();
+        var modules = code.modules;
+        var total = modules.size() + 2 * QUIET_MODULES;
+        var barH = h * 30 / 100;
+        var textH = _showText ? fontH : 0;
+        var bandTop = (h - barH - textH) / 2;
+        var width = 2 * Ui.halfWidthBetween(dc, bandTop, bandTop + barH + textH) + (Ui.isRound() ? 12 : 8);
+        var px = width / total;
+        if (px < MIN_LINEAR_PX) {
+            var lines = Ui.wrap(dc, "Too large for this screen: needs " + total + " px, " + width + " px available",
+                font, 2 * Ui.halfWidthAt(dc, h / 2) - 16);
+            var y = h / 2 - lines.size() * fontH / 2;
+            for (var i = 0; i < lines.size(); i++) {
+                dc.drawText(w / 2, y, font, lines[i], Graphics.TEXT_JUSTIFY_CENTER);
+                y += fontH;
+            }
+            return;
+        }
+        var x0 = (w - modules.size() * px) / 2;
+        dc.setColor(Graphics.COLOR_BLACK, Graphics.COLOR_WHITE);
+        var i = 0;
+        var n = modules.size();
+        while (i < n) {
+            if (modules[i] == 1) {
+                var start = i;
+                while (i < n && modules[i] == 1) {
+                    i++;
+                }
+                dc.fillRectangle(x0 + start * px, bandTop, (i - start) * px, barH);
+            } else {
+                i++;
+            }
+        }
+        if (_showText) {
+            dc.drawText(w / 2, bandTop + barH + 2, font, code.text, Graphics.TEXT_JUSTIFY_CENTER);
+        }
+    }
+}
+
+// Input on a code: a tap asks for full brightness again; BACK closes.
+class CodeDelegate extends WatchUi.BehaviorDelegate {
+
+    function initialize() {
+        BehaviorDelegate.initialize();
+    }
+
+    function onTap(event as WatchUi.ClickEvent) as Boolean {
+        boost();
+        return true;
+    }
+
+    function onSelect() as Boolean {
+        boost();
+        return true;
+    }
+
+    private function boost() as Void {
+        AppState.activity();
+        var current = WatchUi.getCurrentView()[0];
+        if (current instanceof CodeView) {
+            current.boostBrightness();
+        }
+    }
+
+    function onBack() as Boolean {
+        var current = WatchUi.getCurrentView()[0];
+        if (current instanceof CodeView && current.header.locked && AppState.theVault().session.autoLockMs == 0) {
+            AppState.lock();
+        }
+        WatchUi.popView(WatchUi.SLIDE_RIGHT);
+        return true;
+    }
+}