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>

breadpad-shared/Cargo.toml

@@ -7,7 +7,7 @@ authors.workspace = true
 
 
 [dependencies]
-bread-theme = { git = "https://github.com/Breadway/bread-ecosystem", tag = "v0.2.6" }
+bread-theme = { git = "https://github.com/Breadway/bread-ecosystem", tag = "v0.2.7", features = ["gtk"] }
 anyhow.workspace = true
 tracing.workspace = true
 serde.workspace = true