Update flake inputs; drop navidrome; fix noto-fonts subset glob

- Update nixpkgs (Feb 27), home-manager, microvm, nix-index-database,
  claude-code-nix, dailybot
- Remove navidrome service, nginx proxy, dashy entry, and gatus monitor
- Add noto-fonts-subset patch for libreoffice/collabora (noto-fonts
  2026.02.01 switched from variable to static font filenames)
- Add incus-lts writableTmpDirAsHomeHook overlay for sandbox HOME fix
- Add samba4Full overlay to disable CephFS (ceph pinned to python3.11)

overlays/default.nix

@@ -4,4 +4,15 @@ final: prev:
 let
   system = prev.system;
 in
-{ }
+{
+  # Disable CephFS support in samba to work around upstream nixpkgs bug:
+  # ceph is pinned to python3.11 which is incompatible with sphinx >= 9.1.0.
+  # https://github.com/NixOS/nixpkgs/issues/442652
+  samba4Full = prev.samba4Full.override { enableCephFS = false; };
+
+  # Fix incus-lts doc build: `incus manpage` tries to create
+  # ~/.config/incus, but HOME is /homeless-shelter in the nix sandbox.
+  incus-lts = prev.incus-lts.overrideAttrs (old: {
+    nativeBuildInputs = (old.nativeBuildInputs or [ ]) ++ [ prev.writableTmpDirAsHomeHook ];
+  });
+}