workspaces: a pill top left on every monitor with its workspaces

- one window per monitor (namespace magic-workspaces, Overlay like the
  island), showing that monitor's hyprland workspaces in the island's
  look: cover gradient, pink glow
- focused workspace pink, shown-elsewhere soft pink, empty ones dim;
  hover eases in (one at a time), a click switches workspace
- special workspaces are skipped; name-only ones show their first letter
- event-driven through Workspaces: redraws only on hyprland events and
  hover

src/main.rs

@@ -3,6 +3,7 @@ mod island;
 mod parse;
 mod sound;
 mod spectrum;
+mod workspaces;
 
 use amane::{App, Palette, Service};
 
@@ -10,6 +11,11 @@ fn main() {
     // the card's glow follows the cover art, which art::Art copies to this one path
     Palette::write().open(&art::palette_file(), 8);
 
-    // one island on every monitor; the card opens only on one of them
-    App::new().font("Fira Code").ipc("island", island::command).window_per_monitor(island::view).run();
+    // one island on every monitor (the card opens only on one of them), and a workspace pill top left on each
+    App::new()
+        .font("Fira Code")
+        .ipc("island", island::command)
+        .window_per_monitor(island::view)
+        .window_per_monitor(workspaces::view)
+        .run();
 }