Fix illegible text on light pywal palettes + hot-reload

Use bread-theme 0.2.7's luminance-picked ink (@on-*): type chips on @overlay and
selected sidebar rows / confirm buttons on @blue kept @fg or @bg, which vanished
when those slots came out light/dark. They now use @on-overlay / @on-accent.

Add breadpad_shared::theme::apply_live (wraps bread_theme::gtk::apply_app_css) so
breadpad and breadman recolour live on `bread-theme reload` and re-read the user's
style.css — replacing the build-once provider. bread-theme bumped to v0.2.7
(gtk feature).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Cargo.lock

@@ -305,9 +305,10 @@ dependencies = [
 [[package]]
 name = "bread-theme"
 version = "0.2.3"
-source = "git+https://github.com/Breadway/bread-ecosystem?tag=v0.2.6#0c8c5c00e435fedff4f81e36d603424c153519a9"
+source = "git+https://github.com/Breadway/bread-ecosystem?tag=v0.2.7#ea87083c0615fc9141b0ae4c99f833748a0189d1"
 dependencies = [
  "dirs 5.0.1",
+ "gtk4",
  "serde",
  "serde_json",
 ]