feat(hyprland): restore media-key OSD with swayosd

The XF86 binds survived the noctalia -> eww switch, but the popup they
drew did not, so volume and brightness changed with no feedback. swayosd
replaces it: swayosd-client both applies the change and draws the OSD.

Also fixes two binds that pointed at binaries no host installs any more:
XF86AudioMicMute called volumectl (avizo, removed) and the brightness
keys called brightnessctl, which only arrakis has.

Commands are referenced by store path because Hyprland execs binds with
the PATH the session was started with.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

home/common/programs/hyprland/default.nix

@@ -10,6 +10,8 @@ let
 
   hyprPkgs = inputs.hyprland.packages.${pkgs.stdenv.hostPlatform.system};
 
+  osd = "${pkgs.swayosd}/bin/swayosd-client";
+
   # xdph runs this instead of hyprland-share-picker (screencopy:custom_picker_binary).
   # The contract is just "print [SELECTION] to stdout"; a leading "r" grants a
   # restore token. Printing it immediately means the dialog never renders.
@@ -365,18 +367,21 @@ in
           hl.dispatch(hl.dsp.window.center())
         end)
 
-        -- volume / brightness (locked so they work on the lock screen; repeat on hold)
-        hl.bind("XF86AudioRaiseVolume", hl.dsp.exec_cmd("wpctl set-volume @DEFAULT_AUDIO_SINK@ 5%+"), { locked = true, repeating = true })
-        hl.bind("XF86AudioLowerVolume", hl.dsp.exec_cmd("wpctl set-volume @DEFAULT_AUDIO_SINK@ 5%-"), { locked = true, repeating = true })
-        hl.bind("XF86MonBrightnessUp", hl.dsp.exec_cmd("brightnessctl set 5%+"), { locked = true, repeating = true })
-        hl.bind("XF86MonBrightnessDown", hl.dsp.exec_cmd("brightnessctl set 5%-"), { locked = true, repeating = true })
+        -- volume / brightness / media (locked so they work on the lock screen;
+        -- volume and brightness repeat on hold). Everything goes through
+        -- swayosd-client, which applies the change and draws the OSD popup;
+        -- store paths because Hyprland execs these with the login PATH, which
+        -- doesn't pick up profile changes made after the session started.
+        hl.bind("XF86AudioRaiseVolume", hl.dsp.exec_cmd("${osd} --output-volume raise"), { locked = true, repeating = true })
+        hl.bind("XF86AudioLowerVolume", hl.dsp.exec_cmd("${osd} --output-volume lower"), { locked = true, repeating = true })
+        hl.bind("XF86MonBrightnessUp", hl.dsp.exec_cmd("${osd} --brightness raise"), { locked = true, repeating = true })
+        hl.bind("XF86MonBrightnessDown", hl.dsp.exec_cmd("${osd} --brightness lower"), { locked = true, repeating = true })
 
-        -- media keys (locked)
-        hl.bind("XF86AudioMute", hl.dsp.exec_cmd("pactl set-sink-mute @DEFAULT_SINK@ toggle"), { locked = true })
-        hl.bind("XF86AudioMicMute", hl.dsp.exec_cmd("volumectl -m toggle-mute"), { locked = true })
-        hl.bind("XF86AudioNext", hl.dsp.exec_cmd("playerctl next"), { locked = true })
-        hl.bind("XF86AudioPrev", hl.dsp.exec_cmd("playerctl previous"), { locked = true })
-        hl.bind("XF86AudioPlay", hl.dsp.exec_cmd("playerctl play-pause"), { locked = true })
+        hl.bind("XF86AudioMute", hl.dsp.exec_cmd("${osd} --output-volume mute-toggle"), { locked = true })
+        hl.bind("XF86AudioMicMute", hl.dsp.exec_cmd("${osd} --input-volume mute-toggle"), { locked = true })
+        hl.bind("XF86AudioNext", hl.dsp.exec_cmd("${osd} --playerctl next"), { locked = true })
+        hl.bind("XF86AudioPrev", hl.dsp.exec_cmd("${osd} --playerctl prev"), { locked = true })
+        hl.bind("XF86AudioPlay", hl.dsp.exec_cmd("${osd} --playerctl play-pause"), { locked = true })
 
         -- move/resize windows with mod + LMB/RMB drag
         hl.bind(mod .. " + mouse:272", hl.dsp.window.drag(), { mouse = true })

home/common/programs/hyprland/shell.nix

@@ -44,5 +44,41 @@
     };
   };
 
+  # swayosd: the on-screen volume/brightness/caps-lock popup. Noctalia drew this
+  # before; without it the XF86 keys still work but give no feedback, which reads
+  # as "the keys are dead". swayosd-client does the change *and* the popup, so the
+  # binds in default.nix call it instead of wpctl/brightnessctl directly.
+  services.swayosd = {
+    enable = true;
+    topMargin = 0.85;
+    stylePath = pkgs.writeText "swayosd-style.css" ''
+      window#osd {
+        padding: 12px 20px;
+        border-radius: 12px;
+        border: 1px solid #4c566a;
+        background: alpha(#2e3440, 0.94);
+      }
+
+      window#osd #container { margin: 12px; }
+
+      window#osd image,
+      window#osd label { color: #eceff4; }
+
+      window#osd progressbar:disabled { opacity: 0.5; }
+
+      window#osd trough {
+        min-height: 6px;
+        border-radius: 6px;
+        background: #434c5e;
+      }
+
+      window#osd progress {
+        min-height: 6px;
+        border-radius: 6px;
+        background: #88c0d0;
+      }
+    '';
+  };
+
   services.hyprpolkitagent.enable = true;
 }