From a7e2335c20c1ae10767b872a7ed008b868758e52 Mon Sep 17 00:00:00 2001
From: daniel-c-harvey <the.real.daniel.harvey@gmail.com>
Date: Sat, 13 Jun 2026 11:08:43 -0400
Subject: [PATCH] Add Edit action to medium browsers; extract
 CmsMediumBrowserBase + CmsMediumTable

Session/Mix browsers share base (load/state/thumb) and a shared table shell carrying the per-row Edit link to BatchEdit; subclasses supply only their medium action.
---
 .../Pages/Tracks/CmsMediumBrowserBase.cs      |  62 +++++++
 .../Pages/Tracks/CmsMediumTable.razor         |  74 +++++++++
 .../Pages/Tracks/CmsMediumTable.razor.css     |  14 ++
 .../Pages/Tracks/CmsMixBrowser.razor          | 147 ++++++-----------
 .../Pages/Tracks/CmsMixBrowser.razor.css      |  15 --
 .../Pages/Tracks/CmsSessionBrowser.razor      | 153 ++++++------------
 .../Pages/Tracks/CmsSessionBrowser.razor.css  |   6 +-
 7 files changed, 245 insertions(+), 226 deletions(-)
 create mode 100644 DeepDrftManager/Components/Pages/Tracks/CmsMediumBrowserBase.cs
 create mode 100644 DeepDrftManager/Components/Pages/Tracks/CmsMediumTable.razor
 create mode 100644 DeepDrftManager/Components/Pages/Tracks/CmsMediumTable.razor.css
 delete mode 100644 DeepDrftManager/Components/Pages/Tracks/CmsMixBrowser.razor.css

diff --git a/DeepDrftManager/Components/Pages/Tracks/CmsMediumBrowserBase.cs b/DeepDrftManager/Components/Pages/Tracks/CmsMediumBrowserBase.cs
new file mode 100644
index 0000000..bd77849
--- /dev/null
+++ b/DeepDrftManager/Components/Pages/Tracks/CmsMediumBrowserBase.cs
@@ -0,0 +1,62 @@
+using DeepDrftManager.Services;
+using DeepDrftModels.DTOs;
+using DeepDrftModels.Enums;
+using Microsoft.AspNetCore.Components;
+using MudBlazor;
+
+namespace DeepDrftManager.Components.Pages.Tracks;
+
+/// <summary>
+/// Shared fetch + state logic for the single-track medium browsers (Sessions, Mixes). Analogous to the
+/// public-site <c>MediumBrowseBase</c>: subclasses supply the <see cref="Medium"/>, the noun used in
+/// error text, and a per-row projection from <see cref="ReleaseDto"/> to their own row model; this base
+/// owns the loading flag, the row list, the initial load, and the cover-thumbnail URL helper. The shared
+/// table structure lives in <c>CmsMediumTable</c>; subclasses render it and fill only the action column.
+/// </summary>
+/// <typeparam name="TRow">The subclass's row model wrapping a <see cref="ReleaseDto"/>.</typeparam>
+public abstract class CmsMediumBrowserBase<TRow> : ComponentBase
+{
+    [Inject] public required ICmsReleaseService CmsReleaseService { get; set; }
+    [Inject] public required ISnackbar Snackbar { get; set; }
+
+    /// <summary>The medium this browser lists. Subclass-supplied constant.</summary>
+    protected abstract ReleaseMedium Medium { get; }
+
+    /// <summary>Plural noun for this medium used in error text (e.g. "sessions", "mixes").</summary>
+    protected abstract string MediumNoun { get; }
+
+    /// <summary>Projects a fetched release into the subclass's row model.</summary>
+    protected abstract TRow ToRow(ReleaseDto release);
+
+    protected List<TRow> Rows { get; private set; } = new();
+    protected bool Loading { get; private set; } = true;
+
+    protected override async Task OnInitializedAsync() => await LoadAsync();
+
+    private async Task LoadAsync()
+    {
+        Loading = true;
+        // Single-track releases; a single generous page covers the CMS catalogue (same small-catalogue
+        // assumption the album browser makes).
+        var result = await CmsReleaseService.GetPagedAsync(
+            Medium, page: 1, pageSize: 100,
+            sortColumn: "Title", sortDescending: false);
+
+        if (result.Success && result.Value is not null)
+        {
+            Rows = result.Value.Items.Select(ToRow).ToList();
+        }
+        else
+        {
+            var error = result.Messages.FirstOrDefault()?.Message ?? "Unknown error";
+            Snackbar.Add($"Failed to load {MediumNoun}: {error}", Severity.Error);
+            Rows = new List<TRow>();
+        }
+
+        Loading = false;
+    }
+
+    // Relative path — resolves against the Manager's own origin, proxied by ImageProxyController.
+    protected static string ThumbUrl(string entryKey) =>
+        $"/api/image/{Uri.EscapeDataString(entryKey)}";
+}
diff --git a/DeepDrftManager/Components/Pages/Tracks/CmsMediumTable.razor b/DeepDrftManager/Components/Pages/Tracks/CmsMediumTable.razor
new file mode 100644
index 0000000..07e97e4
--- /dev/null
+++ b/DeepDrftManager/Components/Pages/Tracks/CmsMediumTable.razor
@@ -0,0 +1,74 @@
+@namespace DeepDrftManager.Components.Pages.Tracks
+@typeparam TRow
+@using DeepDrftModels.DTOs
+
+@* Shared table shell for the single-track medium browsers (Sessions, Mixes). Renders the cover
+   thumbnail, title, artist, and a shared Edit affordance that every medium gets (9.5.E). The
+   medium-specific cells (hero / waveform / generate-or-upload action) are supplied per row via the
+   ActionContent slot, which receives the subclass's typed row. Fully controlled by the parent:
+   loading and row state are passed in. *@
+
+@if (Loading)
+{
+    <MudProgressCircular Indeterminate="true" Class="mt-4" />
+}
+else if (Rows.Count == 0)
+{
+    <MudText Typo="Typo.body1" Class="mt-4">@EmptyMessage</MudText>
+}
+else
+{
+    <MudTable T="TRow" Items="Rows" Hover="true" Striped="true" Dense="true" Bordered="false" FixedHeader="true">
+        <HeaderContent>
+            <MudTh Style="width: 1%;">Cover</MudTh>
+            <MudTh>@TitleHeader</MudTh>
+            <MudTh>Artist</MudTh>
+            <MudTh Style="width: 1%; white-space: nowrap;">Actions</MudTh>
+        </HeaderContent>
+        <RowTemplate>
+            <MudTd DataLabel="Cover">
+                @{ var release = ReleaseAccessor(context); }
+                @if (!string.IsNullOrEmpty(release.ImagePath))
+                {
+                    <div class="cms-album-thumb" style="background-image: url('@ThumbUrl(release.ImagePath)');"></div>
+                }
+                else
+                {
+                    <div class="cms-album-thumb cms-album-thumb--fallback"></div>
+                }
+            </MudTd>
+            <MudTd DataLabel="@TitleHeader">@ReleaseAccessor(context).Title</MudTd>
+            <MudTd DataLabel="Artist">@ReleaseAccessor(context).Artist</MudTd>
+            <MudTd DataLabel="Actions">
+                <MudStack Row="true" AlignItems="AlignItems.Center" Spacing="2">
+                    @ActionContent(context)
+                    <MudTooltip Text="Edit release">
+                        <MudIconButton Icon="@Icons.Material.Filled.Edit"
+                                       Size="Size.Small"
+                                       Color="Color.Primary"
+                                       Href="@($"/tracks/album/{Uri.EscapeDataString(ReleaseAccessor(context).Title)}/edit")" />
+                    </MudTooltip>
+                </MudStack>
+            </MudTd>
+        </RowTemplate>
+    </MudTable>
+}
+
+@code {
+    [Parameter] public required IReadOnlyList<TRow> Rows { get; set; }
+    [Parameter] public bool Loading { get; set; }
+
+    /// <summary>Projects a row to its underlying release for the cover/title/artist cells.</summary>
+    [Parameter] public required Func<TRow, ReleaseDto> ReleaseAccessor { get; set; }
+
+    /// <summary>Medium-specific cell content (hero / waveform / generate action) for each row.</summary>
+    [Parameter] public required RenderFragment<TRow> ActionContent { get; set; }
+
+    /// <summary>Relative thumbnail URL builder; the base class supplies its proxy-aware helper.</summary>
+    [Parameter] public required Func<string, string> ThumbUrl { get; set; }
+
+    /// <summary>Column header / data-label for the title column (e.g. "Session", "Mix").</summary>
+    [Parameter] public string TitleHeader { get; set; } = "Title";
+
+    [Parameter] public string EmptyMessage { get; set; } = "Nothing here yet.";
+}
diff --git a/DeepDrftManager/Components/Pages/Tracks/CmsMediumTable.razor.css b/DeepDrftManager/Components/Pages/Tracks/CmsMediumTable.razor.css
new file mode 100644
index 0000000..3b1ba83
--- /dev/null
+++ b/DeepDrftManager/Components/Pages/Tracks/CmsMediumTable.razor.css
@@ -0,0 +1,14 @@
+/* Cover-thumbnail idiom shared by the medium browsers' tables. Blazor CSS isolation is per-component,
+   so this scoped copy of the album-browser thumb classes reaches only this component's own markup. */
+.cms-album-thumb {
+    width: 40px;
+    height: 40px;
+    border-radius: 4px;
+    background-size: cover;
+    background-position: center;
+    flex-shrink: 0;
+}
+
+.cms-album-thumb--fallback {
+    background-color: var(--mud-palette-action-default-hover);
+}
diff --git a/DeepDrftManager/Components/Pages/Tracks/CmsMixBrowser.razor b/DeepDrftManager/Components/Pages/Tracks/CmsMixBrowser.razor
index dca76a2..e39be57 100644
--- a/DeepDrftManager/Components/Pages/Tracks/CmsMixBrowser.razor
+++ b/DeepDrftManager/Components/Pages/Tracks/CmsMixBrowser.razor
@@ -1,10 +1,8 @@
 @page "/tracks/mixes"
-@using DeepDrftManager.Services
+@inherits CmsMediumBrowserBase<CmsMixBrowser.MixRow>
 @using DeepDrftModels.DTOs
 @using DeepDrftModels.Enums
 @attribute [Authorize]
-@inject ICmsReleaseService CmsReleaseService
-@inject ISnackbar Snackbar
 @inject ILogger<CmsMixBrowser> Logger
 
 <PageTitle>Mixes — DeepDrft CMS</PageTitle>
@@ -19,109 +17,54 @@
 
     <MudText Typo="Typo.h4" GutterBottom="true">Mixes</MudText>
 
-    @if (_loading)
-    {
-        <MudProgressCircular Indeterminate="true" Class="mt-4" />
-    }
-    else if (_rows.Count == 0)
-    {
-        <MudText Typo="Typo.body1" Class="mt-4">No mixes found.</MudText>
-    }
-    else
-    {
-        <MudTable T="MixRow" Items="_rows" Hover="true" Striped="true" Dense="true" Bordered="false" FixedHeader="true">
-            <HeaderContent>
-                <MudTh Style="width: 1%;">Cover</MudTh>
-                <MudTh>Mix</MudTh>
-                <MudTh>Artist</MudTh>
-                <MudTh Style="width: 1%; white-space: nowrap;">Waveform</MudTh>
-                <MudTh Style="width: 1%; white-space: nowrap;">Actions</MudTh>
-            </HeaderContent>
-            <RowTemplate>
-                <MudTd DataLabel="Cover">
-                    @if (!string.IsNullOrEmpty(context.Release.ImagePath))
-                    {
-                        <div class="cms-album-thumb" style="background-image: url('@ThumbUrl(context.Release.ImagePath)');"></div>
-                    }
-                    else
-                    {
-                        <div class="cms-album-thumb cms-album-thumb--fallback"></div>
-                    }
-                </MudTd>
-                <MudTd DataLabel="Mix">@context.Release.Title</MudTd>
-                <MudTd DataLabel="Artist">@context.Release.Artist</MudTd>
-                <MudTd DataLabel="Waveform">
-                    @if (context.HasWaveform)
-                    {
-                        <MudTooltip Text="Waveform generated">
-                            <MudIcon Icon="@Icons.Material.Filled.CheckCircle" Color="Color.Success" Size="Size.Small" />
-                        </MudTooltip>
-                    }
-                    else
-                    {
-                        <MudTooltip Text="No waveform — incomplete">
-                            <MudIcon Icon="@Icons.Material.Filled.Cancel" Color="Color.Warning" Size="Size.Small" />
-                        </MudTooltip>
-                    }
-                </MudTd>
-                <MudTd DataLabel="Actions">
-                    <MudButton Variant="Variant.Outlined"
-                               Size="Size.Small"
-                               StartIcon="@Icons.Material.Filled.GraphicEq"
-                               Disabled="@context.IsGenerating"
-                               OnClick="@(() => GenerateWaveformAsync(context))">
-                        @if (context.IsGenerating)
-                        {
-                            <MudProgressCircular Class="mr-2" Size="Size.Small" Indeterminate="true" />
-                            <span>Generating…</span>
-                        }
-                        else
-                        {
-                            <span>@(context.HasWaveform ? "Regenerate" : "Generate")</span>
-                        }
-                    </MudButton>
-                </MudTd>
-            </RowTemplate>
-        </MudTable>
-    }
+    <CmsMediumTable TRow="MixRow"
+                    Rows="Rows"
+                    Loading="Loading"
+                    ReleaseAccessor="@(row => row.Release)"
+                    ThumbUrl="@(key => ThumbUrl(key))"
+                    TitleHeader="Mix"
+                    EmptyMessage="No mixes found.">
+        <ActionContent Context="row">
+            @if (row.HasWaveform)
+            {
+                <MudTooltip Text="Waveform generated">
+                    <MudIcon Icon="@Icons.Material.Filled.CheckCircle" Color="Color.Success" Size="Size.Small" />
+                </MudTooltip>
+            }
+            else
+            {
+                <MudTooltip Text="No waveform — incomplete">
+                    <MudIcon Icon="@Icons.Material.Filled.Cancel" Color="Color.Warning" Size="Size.Small" />
+                </MudTooltip>
+            }
+            <MudButton Variant="Variant.Outlined"
+                       Size="Size.Small"
+                       StartIcon="@Icons.Material.Filled.GraphicEq"
+                       Disabled="@row.IsGenerating"
+                       OnClick="@(() => GenerateWaveformAsync(row))">
+                @if (row.IsGenerating)
+                {
+                    <MudProgressCircular Class="mr-2" Size="Size.Small" Indeterminate="true" />
+                    <span>Generating…</span>
+                }
+                else
+                {
+                    <span>@(row.HasWaveform ? "Regenerate" : "Generate")</span>
+                }
+            </MudButton>
+        </ActionContent>
+    </CmsMediumTable>
 </MudContainer>
 
 @code {
-    private List<MixRow> _rows = new();
-    private bool _loading = true;
+    protected override ReleaseMedium Medium => ReleaseMedium.Mix;
+    protected override string MediumNoun => "mixes";
 
-    protected override async Task OnInitializedAsync() => await LoadAsync();
-
-    private async Task LoadAsync()
+    protected override MixRow ToRow(ReleaseDto release) => new()
     {
-        _loading = true;
-        // Mixes are single-track releases; a single generous page covers the CMS catalogue.
-        var result = await CmsReleaseService.GetPagedAsync(
-            ReleaseMedium.Mix, page: 1, pageSize: 100,
-            sortColumn: "Title", sortDescending: false);
-
-        if (result.Success && result.Value is not null)
-        {
-            _rows = result.Value.Items
-                .Select(r => new MixRow
-                {
-                    Release = r,
-                    HasWaveform = !string.IsNullOrEmpty(r.MixMetadata?.WaveformEntryKey)
-                })
-                .ToList();
-        }
-        else
-        {
-            var error = result.Messages.FirstOrDefault()?.Message ?? "Unknown error";
-            Snackbar.Add($"Failed to load mixes: {error}", Severity.Error);
-            _rows = new List<MixRow>();
-        }
-        _loading = false;
-    }
-
-    // Relative path — resolves against the Manager's own origin, proxied by ImageProxyController.
-    private static string ThumbUrl(string entryKey) =>
-        $"/api/image/{Uri.EscapeDataString(entryKey)}";
+        Release = release,
+        HasWaveform = !string.IsNullOrEmpty(release.MixMetadata?.WaveformEntryKey)
+    };
 
     private async Task GenerateWaveformAsync(MixRow row)
     {
@@ -156,7 +99,7 @@
         }
     }
 
-    private sealed class MixRow
+    public sealed class MixRow
     {
         public required ReleaseDto Release { get; set; }
         public bool HasWaveform { get; set; }
diff --git a/DeepDrftManager/Components/Pages/Tracks/CmsMixBrowser.razor.css b/DeepDrftManager/Components/Pages/Tracks/CmsMixBrowser.razor.css
deleted file mode 100644
index dcb8151..0000000
--- a/DeepDrftManager/Components/Pages/Tracks/CmsMixBrowser.razor.css
+++ /dev/null
@@ -1,15 +0,0 @@
-/* Scoped duplicate of the album-browser thumb idiom. Blazor CSS isolation is per-component, so the
-   class defined in CmsAlbumBrowser.razor.css does not reach this component's markup — a small,
-   intentional duplication rather than promoting a two-rule block to global app.css. */
-.cms-album-thumb {
-    width: 40px;
-    height: 40px;
-    border-radius: 4px;
-    background-size: cover;
-    background-position: center;
-    flex-shrink: 0;
-}
-
-.cms-album-thumb--fallback {
-    background-color: var(--mud-palette-action-default-hover);
-}
diff --git a/DeepDrftManager/Components/Pages/Tracks/CmsSessionBrowser.razor b/DeepDrftManager/Components/Pages/Tracks/CmsSessionBrowser.razor
index 5e93ccc..3740495 100644
--- a/DeepDrftManager/Components/Pages/Tracks/CmsSessionBrowser.razor
+++ b/DeepDrftManager/Components/Pages/Tracks/CmsSessionBrowser.razor
@@ -1,13 +1,10 @@
 @page "/tracks/sessions"
-@using DeepDrftManager.Services
+@inherits CmsMediumBrowserBase<CmsSessionBrowser.SessionRow>
 @using DeepDrftModels.DTOs
 @using DeepDrftModels.Enums
 @using Microsoft.AspNetCore.Components.Forms
 @attribute [Authorize]
-@inject ICmsReleaseService CmsReleaseService
-@inject ISnackbar Snackbar
 @inject ILogger<CmsSessionBrowser> Logger
-@inject NavigationManager Navigation
 
 <PageTitle>Sessions — DeepDrft CMS</PageTitle>
 
@@ -21,112 +18,56 @@
 
     <MudText Typo="Typo.h4" GutterBottom="true">Sessions</MudText>
 
-    @if (_loading)
-    {
-        <MudProgressCircular Indeterminate="true" Class="mt-4" />
-    }
-    else if (_rows.Count == 0)
-    {
-        <MudText Typo="Typo.body1" Class="mt-4">No sessions found.</MudText>
-    }
-    else
-    {
-        <MudTable T="SessionRow" Items="_rows" Hover="true" Striped="true" Dense="true" Bordered="false" FixedHeader="true">
-            <HeaderContent>
-                <MudTh Style="width: 1%;">Cover</MudTh>
-                <MudTh Style="width: 1%;">Hero</MudTh>
-                <MudTh>Session</MudTh>
-                <MudTh>Artist</MudTh>
-                <MudTh Style="width: 1%; white-space: nowrap;">Actions</MudTh>
-            </HeaderContent>
-            <RowTemplate>
-                <MudTd DataLabel="Cover">
-                    @if (!string.IsNullOrEmpty(context.Release.ImagePath))
-                    {
-                        <div class="cms-album-thumb" style="background-image: url('@ThumbUrl(context.Release.ImagePath)');"></div>
-                    }
-                    else
-                    {
-                        <div class="cms-album-thumb cms-album-thumb--fallback"></div>
-                    }
-                </MudTd>
-                <MudTd DataLabel="Hero">
-                    @if (context.HeroImageEntryKey is { Length: > 0 } heroKey)
-                    {
-                        <div class="cms-album-thumb" style="background-image: url('@ThumbUrl(heroKey)');"></div>
-                    }
-                    else
-                    {
-                        <div class="cms-album-thumb cms-album-thumb--fallback"></div>
-                    }
-                </MudTd>
-                <MudTd DataLabel="Session">@context.Release.Title</MudTd>
-                <MudTd DataLabel="Artist">@context.Release.Artist</MudTd>
-                <MudTd DataLabel="Actions">
-                    <MudFileUpload T="IBrowserFile"
-                                   Accept="image/*"
-                                   FilesChanged="@(file => UploadHeroAsync(context, file))"
-                                   Disabled="@context.IsUploading">
-                        <ActivatorContent>
-                            <MudButton Variant="Variant.Outlined"
-                                       Size="Size.Small"
-                                       StartIcon="@Icons.Material.Filled.Image"
-                                       Disabled="@context.IsUploading">
-                                @if (context.IsUploading)
-                                {
-                                    <MudProgressCircular Class="mr-2" Size="Size.Small" Indeterminate="true" />
-                                    <span>Uploading…</span>
-                                }
-                                else
-                                {
-                                    <span>@(context.HeroImageEntryKey is { Length: > 0 } ? "Replace hero" : "Set hero")</span>
-                                }
-                            </MudButton>
-                        </ActivatorContent>
-                    </MudFileUpload>
-                </MudTd>
-            </RowTemplate>
-        </MudTable>
-    }
+    <CmsMediumTable TRow="SessionRow"
+                    Rows="Rows"
+                    Loading="Loading"
+                    ReleaseAccessor="@(row => row.Release)"
+                    ThumbUrl="@(key => ThumbUrl(key))"
+                    TitleHeader="Session"
+                    EmptyMessage="No sessions found.">
+        <ActionContent Context="row">
+            @if (row.HeroImageEntryKey is { Length: > 0 } heroKey)
+            {
+                <div class="cms-album-thumb" style="background-image: url('@ThumbUrl(heroKey)');"></div>
+            }
+            else
+            {
+                <div class="cms-album-thumb cms-album-thumb--fallback"></div>
+            }
+            <MudFileUpload T="IBrowserFile"
+                           Accept="image/*"
+                           FilesChanged="@(file => UploadHeroAsync(row, file))"
+                           Disabled="@row.IsUploading">
+                <ActivatorContent>
+                    <MudButton Variant="Variant.Outlined"
+                               Size="Size.Small"
+                               StartIcon="@Icons.Material.Filled.Image"
+                               Disabled="@row.IsUploading">
+                        @if (row.IsUploading)
+                        {
+                            <MudProgressCircular Class="mr-2" Size="Size.Small" Indeterminate="true" />
+                            <span>Uploading…</span>
+                        }
+                        else
+                        {
+                            <span>@(row.HeroImageEntryKey is { Length: > 0 } ? "Replace hero" : "Set hero")</span>
+                        }
+                    </MudButton>
+                </ActivatorContent>
+            </MudFileUpload>
+        </ActionContent>
+    </CmsMediumTable>
 </MudContainer>
 
 @code {
-    private List<SessionRow> _rows = new();
-    private bool _loading = true;
+    protected override ReleaseMedium Medium => ReleaseMedium.Session;
+    protected override string MediumNoun => "sessions";
 
-    protected override async Task OnInitializedAsync() => await LoadAsync();
-
-    private async Task LoadAsync()
+    protected override SessionRow ToRow(ReleaseDto release) => new()
     {
-        _loading = true;
-        // Sessions are single-track releases; a single generous page covers the CMS catalogue (same
-        // small-catalogue assumption the album browser makes).
-        var result = await CmsReleaseService.GetPagedAsync(
-            ReleaseMedium.Session, page: 1, pageSize: 100,
-            sortColumn: "Title", sortDescending: false);
-
-        if (result.Success && result.Value is not null)
-        {
-            _rows = result.Value.Items
-                .Select(r => new SessionRow
-                {
-                    Release = r,
-                    HeroImageEntryKey = r.SessionMetadata?.HeroImageEntryKey
-                })
-                .ToList();
-        }
-        else
-        {
-            var error = result.Messages.FirstOrDefault()?.Message ?? "Unknown error";
-            Snackbar.Add($"Failed to load sessions: {error}", Severity.Error);
-            _rows = new List<SessionRow>();
-        }
-        _loading = false;
-    }
-
-    // Relative path — resolves against the Manager's own origin, proxied by ImageProxyController.
-    private static string ThumbUrl(string entryKey) =>
-        $"/api/image/{Uri.EscapeDataString(entryKey)}";
+        Release = release,
+        HeroImageEntryKey = release.SessionMetadata?.HeroImageEntryKey
+    };
 
     private async Task UploadHeroAsync(SessionRow row, IBrowserFile? file)
     {
@@ -169,7 +110,7 @@
         }
     }
 
-    private sealed class SessionRow
+    public sealed class SessionRow
     {
         public required ReleaseDto Release { get; set; }
         public string? HeroImageEntryKey { get; set; }
diff --git a/DeepDrftManager/Components/Pages/Tracks/CmsSessionBrowser.razor.css b/DeepDrftManager/Components/Pages/Tracks/CmsSessionBrowser.razor.css
index dcb8151..ed71232 100644
--- a/DeepDrftManager/Components/Pages/Tracks/CmsSessionBrowser.razor.css
+++ b/DeepDrftManager/Components/Pages/Tracks/CmsSessionBrowser.razor.css
@@ -1,6 +1,6 @@
-/* Scoped duplicate of the album-browser thumb idiom. Blazor CSS isolation is per-component, so the
-   class defined in CmsAlbumBrowser.razor.css does not reach this component's markup — a small,
-   intentional duplication rather than promoting a two-rule block to global app.css. */
+/* Hero-thumbnail idiom for the session row's action cell. The cover thumb lives in CmsMediumTable's
+   own scoped CSS; this scoped copy reaches only the hero <div> rendered in this component's
+   ActionContent markup (Blazor CSS isolation is per-component). */
 .cms-album-thumb {
     width: 40px;
     height: 40px;