feat(mime): open audio files in Amberol, not mpv

mpv (video) and amberol (audio) are both already in the template suite;
the gap was mime wiring — audio/* still resolved to mpv.desktop. Repoint
the audio types to io.bassi.Amberol.desktop (id verified against the
built package) and broaden coverage to mp3/flac/ogg/opus/wav/m4a/aac,
both canonical and x- names. Video stays on mpv. Degrades to mpv if a
downstream drops Amberol from the suite.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

agent/BACKLOG.md

@@ -256,13 +256,6 @@ window. Wire `on-click-right` in `waybar.nix` AND the whole-swap jsoncs
 (parity rule); add a Hyprland `windowrulev2 = float` for the mixer.
 Ship the mixer in the template's `home.packages`. Pairs with item 41.
 
-### 37. Default video + audio players + mime associations
-(Raised by Bernardo, 2026-07-07 — item 7.) Install a video player and an
-audio player by default in `templates/downstream/home.nix`, and wire the
-mime defaults (item 8's `xdg.mimeApps` surface) so audio/video files open
-in them. (mpv already the video default per HARDWARE-QUEUE — confirm and
-extend to audio; pick the audio player.)
-
 ### 41. Floating-window audit
 (Raised by Bernardo, 2026-07-07 — item 11.) Decide which windows should
 open floating by default (config dialogs, pavucontrol, file-chooser

agent/HARDWARE-QUEUE.md

@@ -236,6 +236,10 @@ QA machine), the **T14s** (webcam case).
       unchanged (the bar still reserves its space). Accepted trade-off
       of `layer: bottom`: a floating window dragged over the top strip
       can now overlap the bar — confirm that's the only regression.
+- [ ] **Audio opens in Amberol** (iteration #60, item 37) — after
+      `home-update`: double-click an mp3/flac/ogg (or `xdg-open song.mp3`)
+      → it opens in Amberol, not mpv; video files still open in mpv.
+      (`xdg-mime query default audio/mpeg` → io.bassi.Amberol.desktop.)
 - [ ] **Capture-to-file keybinds** (iteration #59, item 38) — after
       `home-update` + relogin: SHIFT+Print prompts a region select then
       saves a PNG under ~/Pictures/Screenshots (toast shows the path);

agent/JOURNAL.md

@@ -17,6 +17,22 @@ Template:
 
 ---
 
+## 2026-07-07 — Audio mime → Amberol (iteration #60, item 37)
+- **Task:** BACKLOG item 37 — default video + audio players + mime. On
+  inspection both players were already installed: mpv (video) and amberol
+  (a prior template add). So the real gap was the *mime wiring* — audio
+  files still opened in mpv (mime.nix mapped audio/* → mpv.desktop).
+- **Fix:** `modules/home/mime.nix` — repoint the audio/* types to
+  `io.bassi.Amberol.desktop` (verified against the built package's
+  actual .desktop id + its MimeType set) and broaden coverage (mp3/flac/
+  ogg/opus/wav/m4a/aac, both canonical and x- names). Video stays mpv.
+- **Why Amberol:** GTK4/libadwaita, so it themes via the portal
+  color-scheme the distro already wires; minimal, purpose-built for
+  "open a file → play." Degrades to mpv if a downstream drops it.
+- **Verified:** V0 green; entries mirror the existing working image/video
+  mappings, desktop id confirmed from the realised package. Runtime GIO
+  resolution (double-click an mp3 → Amberol) is a V3 session check (queued).
+
 ## 2026-07-07 — Capture-to-file keybinds (iteration #59, item 38)
 - **Task:** BACKLOG item 38 — direct keybinds for region→file and
   screen→file (the Capture *menu* already had both "→ file" rows).

modules/home/mime.nix

@@ -22,13 +22,27 @@ lib.mkIf config.nomarchy.mime.enable {
       "image/tiff" = "imv.desktop";
       "image/svg+xml" = "imv.desktop";
 
+      # Video → mpv (the template's media player).
       "video/mp4" = "mpv.desktop";
       "video/webm" = "mpv.desktop";
       "video/x-matroska" = "mpv.desktop";
       "video/quicktime" = "mpv.desktop";
-      "audio/mpeg" = "mpv.desktop";
+
-      "audio/flac" = "mpv.desktop";
+      # Audio → Amberol (the template's GTK4 music player). Amberol
-      "audio/ogg" = "mpv.desktop";
+      # registers these types itself, so this only sets the preference over
+      # mpv, which also claims them. Both x- and canonical names because
+      # files report either. Degrades to mpv/whatever if Amberol is dropped.
+      "audio/mpeg" = "io.bassi.Amberol.desktop";
+      "audio/flac" = "io.bassi.Amberol.desktop";
+      "audio/x-flac" = "io.bassi.Amberol.desktop";
+      "audio/ogg" = "io.bassi.Amberol.desktop";
+      "audio/x-vorbis+ogg" = "io.bassi.Amberol.desktop";
+      "audio/opus" = "io.bassi.Amberol.desktop";
+      "audio/wav" = "io.bassi.Amberol.desktop";
+      "audio/x-wav" = "io.bassi.Amberol.desktop";
+      "audio/mp4" = "io.bassi.Amberol.desktop";
+      "audio/x-m4a" = "io.bassi.Amberol.desktop";
+      "audio/aac" = "io.bassi.Amberol.desktop";
 
       # The template's active editor; degrades if you drop vscode.
       "text/plain" = "code.desktop";