Settings: an accent palette folds inside a narrow box

The accent picker's palette takes what the custom well leaves and folds
its swatches; a test puts twelve presets in a 280px box and asserts
they fold under each other inside it. The settings tests split their
appearance cases into a file of their own. AGENTS says editing takes
the owner's handler itself.

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

TASKS.md

@@ -398,3 +398,4 @@ Per-component lines live in `tasks/`. Tags there:
 | T34 | 1 | FAIL | a focused tile's Left and Right, and the guard that leaves arrows to a focused control inside a card, untested |
 | T34 | 2 | PASS | |
 | T35 | 1 | FAIL | a row's control kept its full width past a 280px box; a notice's name shrank to nothing; privacy, notices and startup dropped edits with no handler; Apply's and the reset's rest and a box turned off untested |
+| T35 | 2 | FAIL | an accent picker of nine or more presets still ran past a 280px box |