Timeout-guard hyprctl JSON queries

hyprctl_json used a bare Command::new("hyprctl").output() with no timeout,
used by every geometry_* helper (region/output/window/active_window/
active_output selection) — an unresponsive hyprctl could block screenshot
capture indefinitely. Switched to bread_utils::proc::run_json (path
dependency for now, see the TODO in Cargo.toml).

grim/slurp/wl-copy calls deliberately left untouched: several pipe binary
image data through stdin/stdout (e.g. grim -> wl-copy), which
bread_utils::proc's current run_with_stdin only accepts as &str — adapting
those safely would need a bytes-flavored variant, out of scope for this
pass to avoid risking a regression in image piping.

Cargo.lock

@@ -82,11 +82,21 @@ version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f2032f911046de80f0a198e0901378627c33f59ea0ac00e363d481118bd70a53"
 
+[[package]]
+name = "bread-utils"
+version = "0.2.3"
+dependencies = [
+ "dirs",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "breadshot"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "bread-utils",
  "chrono",
  "clap",
  "dirs",