fix(LevelMeterFab): replace MudFab with hand-rolled button+SVG so band color tinting is no longer overridden by MudBlazor internals

DeepDrftPublic.Client/Controls/AudioPlayerBar/AudioPlayerBar.razor

@@ -1,9 +1,7 @@
 @if (_isMinimized)
 {
     <div class="minimized-dock">
-        <LevelMeterFab Size="Size.Large"
-                       Color="Color.Primary"
-                       OnClick="@ToggleMinimized" />
+        <LevelMeterFab OnClick="@ToggleMinimized" />
     </div>
 }
 else

DeepDrftPublic.Client/Controls/AudioPlayerBar/LevelMeterFab.razor

@@ -1,8 +1,7 @@
 @namespace DeepDrftPublic.Client.Controls.AudioPlayerBar
 
-<div class="lmf-root @_bandClass">
-    <MudFab Color="Color"
-            StartIcon="@Icons.Material.Filled.MusicNote"
-            Size="Size"
-            OnClick="OnClick"/>
-</div>
+<button class="lmf-fab-btn @_bandClass" type="button" @onclick="OnClick">
+    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="lmf-icon" aria-hidden="true">
+        <path fill="currentColor" d="M12 3v10.55c-.59-.34-1.27-.55-2-.55-2.21 0-4 1.79-4 4s1.79 4 4 4 4-1.79 4-4V7h4V3h-6z"/>
+    </svg>
+</button>

DeepDrftPublic.Client/Controls/AudioPlayerBar/LevelMeterFab.razor.cs

@@ -1,6 +1,5 @@
 using DeepDrftPublic.Client.Services;
 using Microsoft.AspNetCore.Components;
-using MudBlazor;
 
 namespace DeepDrftPublic.Client.Controls.AudioPlayerBar;
 
@@ -11,8 +10,6 @@ public partial class LevelMeterFab : ComponentBase, IAsyncDisposable
     [CascadingParameter] public IStreamingPlayerService? PlayerService { get; set; }
 
     [Parameter] public EventCallback OnClick { get; set; }
-    [Parameter] public Size Size { get; set; } = Size.Large;
-    [Parameter] public Color Color { get; set; } = Color.Primary;
 
     // Level-data reduction tuning (see PLAN-level-meter-fab.md §2/§4). The three
     // band boundaries below are the spec contract; the attack/release coefficients

DeepDrftPublic.Client/Controls/AudioPlayerBar/LevelMeterFab.razor.css

@@ -1,27 +1,48 @@
+/* Band color variables — tune here, applied everywhere below */
 :root {
-    --lmf-green: #2ECC71;
+    --lmf-green:  #2ECC71;
     --lmf-yellow: #F4C430;
     --lmf-orange: #FF6B35;
 }
 
-/* The wrapper div is the isolation anchor; MudFab wraps the glyph in its own
-   markup, so the band tint reaches the rendered SVG via :deep(). currentColor
-   on the idle (no-band) state inherits MudFab's Color.Primary contrast text. */
-.lmf-root :deep(svg) {
-    transition: color 120ms ease-out;
+/* Circular FAB matching MudFab Size.Large (56px) with MudBlazor primary palette */
+.lmf-fab-btn {
+    width: 56px;
+    height: 56px;
+    border-radius: 50%;
+    border: none;
+    cursor: pointer;
+    background-color: var(--mud-palette-primary);
+    color: var(--mud-palette-primary-text);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    box-shadow: 0px 3px 5px -1px rgba(0,0,0,.2),
+                0px 6px 10px 0px rgba(0,0,0,.14),
+                0px 1px 18px 0px rgba(0,0,0,.12);
+    transition: box-shadow 150ms ease-out;
+    padding: 0;
 }
 
-.lmf-green :deep(svg) {
-    color: var(--lmf-green);
-    filter: drop-shadow(0 0 6px rgba(46, 204, 113, 0.45));
+.lmf-fab-btn:hover {
+    box-shadow: 0px 7px 8px -4px rgba(0,0,0,.2),
+                0px 12px 17px 2px rgba(0,0,0,.14),
+                0px 5px 22px 4px rgba(0,0,0,.12);
 }
 
-.lmf-yellow :deep(svg) {
-    color: var(--lmf-yellow);
-    filter: drop-shadow(0 0 6px rgba(244, 196, 48, 0.45));
+.lmf-fab-btn:focus-visible {
+    outline: 2px solid var(--mud-palette-primary);
+    outline-offset: 3px;
 }
 
-.lmf-orange :deep(svg) {
-    color: var(--lmf-orange);
-    filter: drop-shadow(0 0 6px rgba(255, 107, 53, 0.45));
+/* The icon SVG — transitions on both color and glow */
+.lmf-icon {
+    width: 24px;
+    height: 24px;
+    transition: color 120ms ease-out, filter 120ms ease-out;
 }
+
+/* Band tints — applied directly to the SVG via fill="currentColor" */
+.lmf-green  .lmf-icon { color: var(--lmf-green);  filter: drop-shadow(0 0 6px rgba(46, 204, 113, 0.45)); }
+.lmf-yellow .lmf-icon { color: var(--lmf-yellow); filter: drop-shadow(0 0 6px rgba(244, 196, 48,  0.45)); }
+.lmf-orange .lmf-icon { color: var(--lmf-orange); filter: drop-shadow(0 0 6px rgba(255, 107, 53,  0.45)); }