chore(logging): sanitize diagnostics and reduce noise

lib/theme/app_tokens.dart

@@ -2,11 +2,7 @@ import 'package:flutter/material.dart';
 
 /// Single source of truth for the app's visual scale.
 ///
-/// Before this existed, radii, cover sizes, badge metrics and motion durations
-/// were written literally at every call site (300+ `BorderRadius.circular`
-/// calls across 70 files, with five different radii for what is visually the
-/// same thumbnail). Anything reused across more than one screen belongs here so
-/// a design change is a one-line edit instead of a grep-and-replace campaign.
+/// Reusable radii, spacing, artwork metrics and motion durations belong here.
 ///
 /// Read it through [AppTokensContext.tokens] rather than
 /// `Theme.of(context).extension<AppTokens>()`, so a widget rendered outside a
@@ -118,9 +114,7 @@ class AppTokens extends ThemeExtension<AppTokens> {
 
   final double headerCollapsedTitleSize;
 
-  /// Expanded title size for every collapsing header in the app. Tab roots used
-  /// to expand to 34 while sub-pages expanded to 28; both now follow this one
-  /// value, which matches the Material 3 large top app bar headline.
+  /// Material 3 large top app bar headline size used by collapsing headers.
   final double headerExpandedTitleSize;
 
   final Duration motionFast;

lib/theme/cover_palette.dart

@@ -5,12 +5,8 @@ import 'package:spotiflac_android/widgets/cached_cover_image.dart';
 
 /// Colour scheme derived from cover art, used to theme detail-screen headers.
 ///
-/// The headers used to hardcode `Colors.white` text over a `Colors.black`
-/// scrim, so they looked identical in light and dark mode and ignored dynamic
-/// colour entirely — and white-on-pale-cover was hard to read. Deriving a
-/// scheme from the artwork keeps the header tinted by the album while still
-/// following the app's brightness, and guarantees the on-colours contrast with
-/// whatever surface ends up behind them.
+/// The generated scheme follows app brightness and supplies contrasting
+/// on-colours for the artwork-derived surface.
 class CoverPalette {
   const CoverPalette._();