bos-settings 0.5.0: GNOME-Settings-style redesign + live app control

New panels: About, Network (Wi-Fi/Ethernet via nmcli), Sound (PipeWire
volume/device via pactl), Date & Time (timedatectl), and Clipboard
(breadclip previously had no bos-settings presence at all despite running
its own daemon).

Layout: every panel now shares one scaffold (6 views were hand-rolling their
own, inconsistently) with a centered, width-capped content column instead of
rows stretching edge-to-edge on a wide window with the control stranded far
from its label. Rows render as individual cards. Sidebar got human labels +
icons + task-based grouping (System/Personalization/Maintenance/About)
instead of raw binary names under "Apps"/"System".

New capability: a shared service_control() widget gives every bread app
backed by a systemd --user daemon (breadd, breadbox-sync, breadcrumbs,
breadmill, breadclipd) live status plus Start/Stop/Restart/View logs —
previously these panels only ever edited a TOML file and hoped the running
process picked it up. breadbar (no systemd unit) gets an equivalent: Save
now actually sends the SIGHUP its own reload mechanism needs, instead of
just claiming to in the hint text.

Fixed two real bugs surfaced while building About: CPU model string kept a
stray leading tab+colon (trim_start_matches was missing '\t'), and GPU
showed "unknown" on hardware whose lspci entry says "Display controller"
instead of "VGA compatible controller".

Local CSS patches (bos-settings/src/theme.rs) for two upstream bread-theme
gaps: suggested/destructive buttons and scale widgets don't clear Adwaita's
default background-image, so flat colour overrides were invisible; and
destructive-action red must not be pywal-derived (it can land on gold
depending on the wallpaper, indistinguishable from a primary action).

src/ui/views/mod.rs

@@ -1,10 +1,15 @@
+pub mod about;
 pub mod bread;
 pub mod breadbar;
 pub mod breadbox;
+pub mod breadclip;
 pub mod breadcrumbs;
 pub mod breadpad;
 pub mod breadpaper;
 pub mod breadsearch;
+pub mod datetime;
 pub mod hyprland;
+pub mod network;
 pub mod packages;
 pub mod snapshots;
+pub mod sound;