🐛 | Code quality fixes

- config.py: move 'import shutil' to module level
- player.py: unify type hints, narrow except, add debug log
- discord_rpc.py: replace broad except Exception with specific types
- gui.py: remove unused import; replace lambda closures with method refs; fix closure scope bug; extract _populate_list_page() to remove duplicate code; add public accessors; make flush_volume public; add AudioVisualizer.reset_activity()
- tests: replace unused _f variable with Path.touch()

discord_rpc.py

@@ -116,7 +116,7 @@ class DiscordRPC:
             log.warning("Discord not running – RPC unavailable")
             self._connected = False
             return False
-        except Exception as exc:
+        except (OSError, RuntimeError, DiscordNotFound) as exc:
             log.debug("Discord RPC connect failed: %s", exc)
             self._connected = False
             return False
@@ -125,7 +125,7 @@ class DiscordRPC:
         if self._rpc:
             try:
                 self._rpc.close()
-            except Exception:
+            except (OSError, RuntimeError):
                 pass
         self._rpc = None
         self._connected = False
@@ -139,7 +139,7 @@ class DiscordRPC:
             if self._connected and self._rpc is not None:
                 try:
                     self._rpc.clear()
-                except Exception:
+                except (OSError, RuntimeError):
                     self._connected = False
             return
 
@@ -162,7 +162,7 @@ class DiscordRPC:
                 start=start,
                 end=end_ts,
             )
-        except Exception as exc:
+        except (OSError, RuntimeError) as exc:
             log.debug("RPC update failed: %s", exc)
             self._connected = False