cleanup: minor midi.py changes for consistency

.pre-commit-config.yaml

@@ -36,4 +36,4 @@ repos:
     hooks:
     -   id: mypy
         args: ["--pretty"]
-        additional_dependencies: ["pygobject-stubs", "types-PyYAML", "types-Markdown", "types-requests", "types-pycurl", "types-chardet", "pytest-stub", "types-orjson", "pathvalidate", "requirements-parser", "icoextract", "fvs", "patool", "git+https://gitlab.com/TheEvilSkeleton/vkbasalt-cli.git@main"]
+        additional_dependencies: ["pygobject-stubs", "types-PyYAML", "types-Markdown", "types-requests", "types-pycurl", "types-chardet", "pytest-stub", "types-orjson", "pathvalidate", "requirements-parser", "icoextract", "fvs", "patool", "pyfluidsynth", "git+https://gitlab.com/TheEvilSkeleton/vkbasalt-cli.git@main"]

bottles/backend/utils/midi.py

@@ -1,5 +1,7 @@
+from typing import Self
+
 from ctypes import c_void_p
-from fluidsynth import cfunc, Synth  # type: ignore[import-not-found]
+from fluidsynth import cfunc, Synth  # type: ignore [import-untyped]
 
 from bottles.backend.logger import Logger
 from bottles.backend.models.config import BottleConfig
@@ -11,11 +13,11 @@
 class FluidSynth:
     """Manages a FluidSynth instance bounded to an unique SoundFont (.sf2, .sf3) file."""
 
-    __active_instances: dict[int, "FluidSynth"] = {}
+    __active_instances: dict[int, Self] = {}
     """Active FluidSynth instances (i.e currently in use by one or more programs)."""
 
     @classmethod
-    def find_or_create(cls, soundfont_path: str) -> "FluidSynth":
+    def find_or_create(cls, soundfont_path: str) -> Self:
         """
         Search for running FluidSynth instance and return it.
         If nonexistent, create and add it to active ones beforehand.