Theme · Importing: a long name gives way, four-digit colors read

A read theme's name is an Ellipsis that gives way beside its mode badge,
so a long name keeps the badge inside a 280px box. parse_hex reads #rgba
as VS Code does, each digit doubled, so a theme with a four-digit color
reads. Tests hold the badge inside the box and read #0008 as black at
0x88 alpha.

TASKS.md

@@ -422,3 +422,4 @@ Per-component lines live in `tasks/`. Tags there:
 | T39a | 1 | FAIL | a larger text size cut the density strip at 280px; ten palette colors had no name; the density and sliders untested |
 | T39a | 2 | FAIL | segments split the strip equally and cut a longer label; the thumb lost its padding's height |
 | T39a | 3 | PASS | |
+| T39b | 1 | FAIL | a long theme name pushed its badge past 280px; four-digit colors refused the theme |