Migrate web GUI to Radzen and propagate PO SourceText to cloud

Web UI:
- Replace terminal-theme Blazor pages with Radzen.Blazor components
  across all pages (Editor, Index, Settings, Translation, etc.)
- Add ReferencesDialog and TranslateKeyDialog
- Add Radzen package reference and a build target that copies Radzen
  static assets into wwwroot/lib/radzen for single-file embedding
- Wire up Radzen theme/scripts in _Layout.cshtml and _Imports.razor

PO / cloud SourceText:
- Add ResourceEntry.SourceText; PoResourceReader now stores msgid as
  SourceText in all PO files and uses msgid as the value for source
  (POT/default) files
- Propagate SourceText/SourcePluralText through LocalEntry,
  LocalEntryExtractor, KeyLevelMerger and the EntryChange sync DTO

Ops:
- Raise nginx client_max_body_size to 100m for large push operations

Author: nickprotop

Commands/WebCommand.cs

@@ -21,6 +21,7 @@
 
 using System.ComponentModel;
 using Microsoft.Extensions.FileProviders;
+using Radzen;
 using Spectre.Console;
 using Spectre.Console.Cli;
 using LocalizationManager.Core.Backends.Json;
@@ -147,6 +148,9 @@ public override int Execute(CommandContext context, Settings settings, Cancellat
         builder.Services.AddRazorPages();
         builder.Services.AddServerSideBlazor();
 
+        // Radzen Blazor components
+        builder.Services.AddRadzenComponents();
+
         // HttpClient for API communication (Blazor components will call localhost API)
         builder.Services.AddHttpClient("LrmApi", client =>
         {

LocalizationManager.Core/Backends/Po/PoResourceReader.cs

@@ -85,7 +85,7 @@ private async Task<ResourceFile> ReadAsyncCore(TextReader reader, LanguageInfo m
             }
 
             // Convert to ResourceEntry
-            var resourceEntry = ConvertToResourceEntry(poEntry, metadata.Code);
+            var resourceEntry = ConvertToResourceEntry(poEntry, metadata);
             entries.Add(resourceEntry);
         }
 
@@ -302,30 +302,38 @@ private void AppendToCurrent(PoEntry entry, PoField field, string value)
         }
     }
 
-    private ResourceEntry ConvertToResourceEntry(PoEntry poEntry, string languageCode)
+    private ResourceEntry ConvertToResourceEntry(PoEntry poEntry, LanguageInfo language)
     {
         var key = poEntry.GenerateKey(_config.KeyStrategy);
 
         if (poEntry.IsPlural && poEntry.MsgStrPlural != null)
         {
             // Convert plural indices to CLDR categories
             var pluralForms = new Dictionary<string, string>();
-            foreach (var (index, value) in poEntry.MsgStrPlural)
+            foreach (var (index, pluralValue) in poEntry.MsgStrPlural)
             {
-                var category = PoPluralMapper.IndexToCategory(languageCode, index);
-                pluralForms[category] = value;
+                var category = PoPluralMapper.IndexToCategory(language.Code, index);
+                pluralForms[category] = pluralValue;
             }
 
+            // For source language (POT files), use msgid as value since msgstr is empty
+            var entryValue = language.IsDefault
+                ? poEntry.MsgId ?? ""
+                : (pluralForms.GetValueOrDefault("other")
+                    ?? pluralForms.GetValueOrDefault("one")
+                    ?? pluralForms.Values.FirstOrDefault()
+                    ?? "");
+
             return new ResourceEntry
             {
                 Key = key,
-                Value = pluralForms.GetValueOrDefault("other")
-                    ?? pluralForms.GetValueOrDefault("one")
-                    ?? pluralForms.Values.FirstOrDefault()
-                    ?? "",
+                Value = entryValue,
                 Comment = poEntry.GetCombinedComment(),
                 IsPlural = true,
-                PluralForms = pluralForms,
+                PluralForms = language.IsDefault ? null : pluralForms, // Don't store plural forms for source language
+                // Store msgid as SourceText (the untranslated source) for all files, not just POT
+                // This allows cloud to have the source text regardless of which language file it came from
+                SourceText = poEntry.MsgId,
                 // Store msgid_plural for translation (source plural text)
                 SourcePluralText = poEntry.MsgIdPlural,
                 References = poEntry.References,  // Transfer references
@@ -338,11 +346,18 @@ private ResourceEntry ConvertToResourceEntry(PoEntry poEntry, string languageCod
             };
         }
 
+        // For source language (POT files), use msgid as value since msgstr is empty
+        // In PO format: msgid = source text, msgstr = translation
+        var value = language.IsDefault ? poEntry.MsgId : poEntry.MsgStr;
+
         return new ResourceEntry
         {
             Key = key,
-            Value = poEntry.MsgStr,
+            Value = value,
             Comment = poEntry.GetCombinedComment(),
+            // Store msgid as SourceText for all PO files (not just POT)
+            // This ensures the cloud always has access to the source text
+            SourceText = poEntry.MsgId,
             References = poEntry.References,  // Transfer references
             // Preserve original formatting
             OriginalFormatting = poEntry.OriginalMsgStrLines != null && poEntry.OriginalMsgStrLines.Any()

LocalizationManager.Core/Cloud/KeyLevelMerger.cs

@@ -48,6 +48,8 @@ public PushChanges ComputePushChanges(
                     Comment = entry.Comment,
                     IsPlural = entry.IsPlural,
                     PluralForms = entry.PluralForms,
+                    SourceText = entry.SourceText,
+                    SourcePluralText = entry.SourcePluralText,
                     BaseHash = null
                 });
             }
@@ -63,6 +65,8 @@ public PushChanges ComputePushChanges(
                     Comment = entry.Comment,
                     IsPlural = entry.IsPlural,
                     PluralForms = entry.PluralForms,
+                    SourceText = entry.SourceText,
+                    SourcePluralText = entry.SourcePluralText,
                     BaseHash = baseHash
                 });
             }
@@ -497,6 +501,18 @@ public class LocalEntry
     public bool IsPlural { get; init; }
     public Dictionary<string, string>? PluralForms { get; init; }
     public required string Hash { get; init; }
+
+    /// <summary>
+    /// Source text for the key (value from default language file, msgid for PO format).
+    /// Only set for entries from the default/source language.
+    /// </summary>
+    public string? SourceText { get; init; }
+
+    /// <summary>
+    /// Source plural text for plural keys (msgid_plural for PO, "other" form for others).
+    /// Only set for plural entries from the default/source language.
+    /// </summary>
+    public string? SourcePluralText { get; init; }
 }
 
 /// <summary>

LocalizationManager.Core/Cloud/LocalEntryExtractor.cs

@@ -57,7 +57,13 @@ public async Task<List<LocalEntry>> ExtractEntriesAsync(
                     Comment = entry.Comment,
                     IsPlural = entry.IsPlural,
                     PluralForms = entry.PluralForms,
-                    Hash = hash
+                    Hash = hash,
+                    // Pass SourceText for storage in ResourceKey.SourceText
+                    // For default language: use entry.SourceText (e.g. msgid for PO) or fall back to Value
+                    // For non-default language: pass entry.SourceText if available (PO format has msgid in all files)
+                    SourceText = lang.IsDefault ? (entry.SourceText ?? entry.Value) : entry.SourceText,
+                    // Pass SourcePluralText (msgid_plural for PO, available in all PO files)
+                    SourcePluralText = entry.SourcePluralText
                 });
             }
         }

LocalizationManager.Core/Cloud/Models/KeySyncDtos.cs

@@ -94,6 +94,18 @@ public class EntryChange
     /// </summary>
     public Dictionary<string, string>? PluralForms { get; set; }
 
+    /// <summary>
+    /// Source text for the key (value from default language, msgid for PO format).
+    /// Only set when pushing from source/default language.
+    /// </summary>
+    public string? SourceText { get; set; }
+
+    /// <summary>
+    /// For plural keys, the source plural text pattern (PO msgid_plural or "other" form).
+    /// Only set when pushing from source/default language.
+    /// </summary>
+    public string? SourcePluralText { get; set; }
+
     /// <summary>
     /// Hash of the entry from last sync (for conflict detection).
     /// Null if this is a new entry.

LocalizationManager.Core/Models/ResourceEntry.cs

@@ -61,6 +61,13 @@ public class ResourceEntry
     /// </summary>
     public string? SourcePluralText { get; set; }
 
+    /// <summary>
+    /// Source text for this entry (PO format: msgid).
+    /// For PO format, this contains the msgid which is the untranslated source text.
+    /// For other formats, this is typically populated with the Value from the default language file.
+    /// </summary>
+    public string? SourceText { get; set; }
+
     /// <summary>
     /// Indicates if this entry is empty/null.
     /// For plural entries, checks if all plural forms are empty.

LocalizationManager.Tests/LocalizationManager.Tests.csproj

@@ -10,8 +10,8 @@
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="6.0.2" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.0" />
-    <PackageReference Include="Microsoft.Extensions.Localization" Version="9.0.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.2" />
+    <PackageReference Include="Microsoft.Extensions.Localization" Version="9.0.2" />
     <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
   </ItemGroup>

LocalizationManager.csproj

@@ -33,6 +33,9 @@
     <PackageReference Include="Spectre.Console.Cli" Version="0.53.0" />
     <PackageReference Include="Terminal.Gui" Version="1.19.0" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="7.2.0" />
+
+    <!-- Web GUI components -->
+    <PackageReference Include="Radzen.Blazor" Version="6.0.0" />
   </ItemGroup>
 
   <ItemGroup>
@@ -92,4 +95,19 @@
     <EmbeddedResource Include="wwwroot\**\*" />
   </ItemGroup>
 
+  <!-- Copy Radzen static assets to wwwroot for embedding in single-file executable -->
+  <Target Name="CopyRadzenAssets" BeforeTargets="Build" Condition="!Exists('wwwroot/lib/radzen/Radzen.Blazor.js')">
+    <PropertyGroup>
+      <RadzenPackagePath>$(NuGetPackageRoot)radzen.blazor/6.0.0/staticwebassets</RadzenPackagePath>
+    </PropertyGroup>
+    <ItemGroup>
+      <RadzenCssFiles Include="$(RadzenPackagePath)/**/*.css" />
+      <RadzenJsFile Include="$(RadzenPackagePath)/Radzen.Blazor.js" />
+    </ItemGroup>
+    <MakeDir Directories="wwwroot/lib/radzen" />
+    <Copy SourceFiles="@(RadzenCssFiles)" DestinationFolder="wwwroot/lib/radzen/%(RecursiveDir)" SkipUnchangedFiles="true" />
+    <Copy SourceFiles="@(RadzenJsFile)" DestinationFolder="wwwroot/lib/radzen" SkipUnchangedFiles="true" />
+    <Message Importance="high" Text="Copied Radzen assets to wwwroot/lib/radzen/" />
+  </Target>
+
 </Project>