feat: add modern shell top bar

Cargo.toml

@@ -7,6 +7,7 @@ members = [
     "crates/ferese-ipc",
     "crates/ferese-layout",
     "crates/ferese-protocols",
+    "shell/ferese-shell",
     "tools/ferese-effects-probe",
     "tools/ferese-malformed-client",
     "tools/ferese-shell-control-probe",
@@ -23,7 +24,9 @@ rust-version = "1.87"
 [workspace.dependencies]
 bitflags = "2.9.4"
 calloop = { version = "0.14.4", features = ["signals"] }
+jiff = "0.2.37"
 libc = "0.2.176"
+libcosmic = { git = "https://github.com/pop-os/libcosmic", rev = "03d7dcb832bc6d15bc1bb07327a1aa426b2d5bc0", default-features = false, features = ["multi-window", "tokio", "wayland"] }
 smithay = { version = "0.7.0", default-features = false, features = [
     "backend_drm",
     "backend_gbm",