[Brand design updates - Core App Components] Add rebrand app icons and refresh the icon picker

[mikescamell]

Task/Issue URL: https://app.asana.com/1/137249556945/project/488551667048375/task/1216795433235473
Tech Design URL (if applicable):
API Proposals URL(s) (if applicable): None

Description

Adds the 2026 rebrand app icons and tidies up the icon picker.

Internal flavour only:

• New launcher icon assets for every colour, round and square, plus monochrome and silhouette variants
• New app shortcut icons
• Change app icon moves to the top of the Appearance screen, gated on the new appIcon flag. With the flag off the screen is unchanged from develop

All build flavours (internal and release):

• Icon picker fits as many columns as the width allows, keeping at least 24dp between icons and wrapping to a new line when there is not enough room
• Selection ring redrawn as a rounded outline that follows the launcher icon mask
• Picker icon size reduced from 75dp to 60dp
• Gold now uses the round gold asset on the settings screen, matching every other colour

Steps to test this PR

Designs

It's worth installing the prod version of this branch and comparing side by side

• To ensure prod still shows the old icons
• To more easily compare changes

If possible, test on a couple of different manufacturers, on different Android versions.

Rebrand icons apply on update (internal build)

• Install an internal build from before this branch
• Update to an internal build of this branch without uninstalling
• Confirm the launcher icon changes to the new rebrand icon
• Go to Settings > Appearance > Change app icon, tap each colour and apply it, and confirm the launcher icon changes to the new version of that colour
• Confirm the icon shown on the Appearance screen matches the applied icon
• Compare against designs
• Note purple in designs has not been updated to Blossom70, which is the value it should be

Change app icon sits at the top (internal build)

• On the Appearance screen, Change app icon is the first item, above Theme
• Confirm the gap below the toolbar looks the same as it did when Theme was the first item

Icon picker layout (test on both internal and release builds)

• Open Change app icon and confirm the icons spread across the full width, with at least 24dp between them, wrapping to a new line when there is not enough room
• Confirm the selection ring follows the icon shape and sits around the currently applied icon
• Confirm the layout looks correct with the existing icons on release, and with the new icons on internal

Nothing internal-only reaches release

• Install the release build: TODO add link
• Confirm the launcher icon artwork is the existing artwork, with none of the new rebrand assets
• Confirm the Appearance screen order is unchanged: Theme, then night mode, then Change app icon

UI changes

See comment here for before/after

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Note

Medium Risk
Internal builds swap launcher component artwork and shortcuts (user-visible on update); release risk is mostly UI layout. Icon switching still uses activity aliases—verify masking and pinned shortcuts across OEMs.

Overview
Introduces 2026 rebrand launcher artwork on the internal build: shared adaptive-icon foregrounds (square/round), monochrome and silhouette variants, per-color backgrounds, and updated app shortcut icons. Release keeps existing launcher assets; only the picker/layout behavior ships there.

Change app icon on Appearance moves above Theme when appBrandDesignUpdate.appIcon() is enabled (runtime reorder in AppearanceActivity, default internal-only).

The icon picker is reworked for all flavours: icons are 64dp (was 75dp), columns are computed from width with ≥24dp gaps (AppIconSpacingDecoration + AppIconCellMetrics), selection uses AppIconOutlineDrawable (launcher mask) instead of a fixed oval border, and AppIcon preview resources point at non-_round mipmaps for consistency with gold and the new art.

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