Add a barcode home screen widget for displaying a selected loyalty card's barcode and with proper orientation handling.

[JorySeverijnse]

Full implementation of the #737 issue. Have tested it out on my android 16 (pixel 9a) for which it works perfectly

Add barcode widget for displaying loyalty card barcodes on home screen

• New BarcodeWidget (AppWidgetProvider) that loads a card from the database, generates a barcode bitmap via ZXing, and renders it on the home screen
• New BarcodeWidgetConfigureActivity with a grid layout for selecting which card to display per widget instance
• Widget supports 1×1 cell minimum size, resizable horizontally and vertically
• Widget metadata, layouts, and manifest entry added

Refactor barcode generation to use fixed dimensions and add optional format display setting

• Replaced density-based dynamic sizing with fixed barcode dimensions (1000×300 for 1D barcodes, 500×500 for 2D)
• Added a setting ("Show barcode type on widget") that toggles the barcode format label visibility below the barcode
• Setting changes apply immediately to all existing widget instances via hotswap

Fix widget resize handling and correct inverted format toggle behavior

• Fixed barcode orientation not updating on widget resize by overriding onAppWidgetOptionsChanged to re-render when the user resizes on the home screen
• Added 90° rotation for 1D barcodes when the widget is taller than wide, filling the vertical space
• Fixed the setting toggle being inverted — the preference change listener was reading the stale value before the preference was saved

Apply ktlint formatting to entire codebase

• Project-wide code style cleanup applied with ktlint

[TheLastProject]

Apply ktlint formatting to entire codebase
Project-wide code style cleanup applied with ktlint

Please drop that commit from your change. It turns a single-feature PR into a 3000 line change, way too much to review properly.

[TheLastProject]

I'm not opposed to introducing some style lint, but that should really be its own unique change.

[JorySeverijnse]

Alright, removed the linting. Also, do you have a suggestion as to what preview icon to use? We are now just using the same one that is being used for the Card list widget @drawable/widget_preview