refactor!: complete application rewrite, modernization, and post-refactor improvements

.codex/config.toml

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+[mcp_servers.avalonia-docs]
+url = "https://docs-mcp.avaloniaui.net/mcp"

.config/dotnet-tools.json

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+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "dotnet-reportgenerator-globaltool": {
+      "version": "5.5.10",
+      "commands": [
+        "reportgenerator"
+      ],
+      "rollForward": false
+    }
+  }
+}

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = crlf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+[*.{csproj,props,targets,slnx}]
+indent_size = 2
+
+[*.cs]
+indent_size = 4
+
+# Baseline C# style. Repository-wide preferences remain advisory where possible;
+# the active GenLauncherGO projects use the stricter severities below.
+dotnet_sort_system_directives_first = true
+dotnet_separate_import_directive_groups = false
+
+csharp_style_namespace_declarations = file_scoped:suggestion
+csharp_style_prefer_method_group_conversion = true:suggestion
+csharp_style_prefer_primary_constructors = false:suggestion
+csharp_style_prefer_null_check_over_type_check = true:suggestion
+csharp_style_prefer_switch_expression = true:suggestion
+csharp_style_prefer_pattern_matching = true:suggestion
+csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
+csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
+csharp_style_prefer_not_pattern = true:suggestion
+csharp_style_prefer_extended_property_pattern = true:suggestion
+csharp_style_prefer_readonly_struct = true:suggestion
+csharp_style_prefer_readonly_struct_member = true:suggestion
+csharp_style_expression_bodied_methods = false:suggestion
+csharp_style_expression_bodied_constructors = false:suggestion
+csharp_style_expression_bodied_operators = false:suggestion
+csharp_style_expression_bodied_properties = true:suggestion
+csharp_style_expression_bodied_indexers = true:suggestion
+csharp_style_expression_bodied_accessors = true:suggestion
+csharp_style_throw_expression = true:suggestion
+csharp_style_conditional_delegate_call = true:suggestion
+csharp_prefer_braces = true:suggestion
+csharp_prefer_simple_using_statement = true:suggestion
+csharp_prefer_static_local_function = true:suggestion
+
+csharp_style_var_for_built_in_types = false:suggestion
+csharp_style_var_when_type_is_apparent = true:suggestion
+csharp_style_var_elsewhere = false:suggestion
+
+dotnet_style_qualification_for_field = false:suggestion
+dotnet_style_qualification_for_property = false:suggestion
+dotnet_style_qualification_for_method = false:suggestion
+dotnet_style_qualification_for_event = false:suggestion
+dotnet_style_predefined_type_for_locals_parameters_members = true:suggestion
+dotnet_style_predefined_type_for_member_access = true:suggestion
+dotnet_style_object_initializer = true:suggestion
+dotnet_style_collection_initializer = true:suggestion
+dotnet_style_coalesce_expression = true:suggestion
+dotnet_style_null_propagation = true:suggestion
+dotnet_style_prefer_is_null_check_over_reference_equality_method = true:suggestion
+dotnet_style_prefer_auto_properties = true:suggestion
+dotnet_style_prefer_inferred_tuple_names = true:suggestion
+dotnet_style_prefer_inferred_anonymous_type_member_names = true:suggestion
+dotnet_style_prefer_simplified_boolean_expressions = true:suggestion
+dotnet_style_prefer_conditional_expression_over_assignment = false:suggestion
+dotnet_style_prefer_conditional_expression_over_return = false:suggestion
+dotnet_style_readonly_field = true:suggestion
+dotnet_style_require_accessibility_modifiers = for_non_interface_members:suggestion
+
+# Naming rules.
+dotnet_naming_rule.types_are_pascal_case.symbols = types
+dotnet_naming_rule.types_are_pascal_case.style = pascal_case
+dotnet_naming_rule.types_are_pascal_case.severity = suggestion
+dotnet_naming_symbols.types.applicable_kinds = class, struct, enum, delegate
+dotnet_naming_style.pascal_case.capitalization = pascal_case
+
+dotnet_naming_rule.interfaces_start_with_i.symbols = interfaces
+dotnet_naming_rule.interfaces_start_with_i.style = prefix_interface_with_i
+dotnet_naming_rule.interfaces_start_with_i.severity = suggestion
+dotnet_naming_symbols.interfaces.applicable_kinds = interface
+dotnet_naming_style.prefix_interface_with_i.required_prefix = I
+dotnet_naming_style.prefix_interface_with_i.capitalization = pascal_case
+
+dotnet_naming_rule.members_are_pascal_case.symbols = members
+dotnet_naming_rule.members_are_pascal_case.style = pascal_case
+dotnet_naming_rule.members_are_pascal_case.severity = suggestion
+dotnet_naming_symbols.members.applicable_kinds = property, method, event
+
+dotnet_naming_rule.non_private_fields_are_pascal_case.symbols = non_private_fields
+dotnet_naming_rule.non_private_fields_are_pascal_case.style = pascal_case
+dotnet_naming_rule.non_private_fields_are_pascal_case.severity = suggestion
+dotnet_naming_symbols.non_private_fields.applicable_kinds = field
+dotnet_naming_symbols.non_private_fields.applicable_accessibilities = public, internal, protected, protected_internal, private_protected
+
+dotnet_naming_rule.private_fields_are_camel_case.symbols = private_fields
+dotnet_naming_rule.private_fields_are_camel_case.style = underscore_camel_case
+dotnet_naming_rule.private_fields_are_camel_case.severity = suggestion
+dotnet_naming_symbols.private_fields.applicable_kinds = field
+dotnet_naming_symbols.private_fields.applicable_accessibilities = private
+dotnet_naming_style.underscore_camel_case.required_prefix = _
+dotnet_naming_style.underscore_camel_case.capitalization = camel_case
+
+dotnet_naming_rule.constants_are_pascal_case.symbols = constants
+dotnet_naming_rule.constants_are_pascal_case.style = pascal_case
+dotnet_naming_rule.constants_are_pascal_case.severity = suggestion
+dotnet_naming_symbols.constants.applicable_kinds = field
+dotnet_naming_symbols.constants.required_modifiers = const
+
+dotnet_naming_rule.async_methods_end_in_async.symbols = async_methods
+dotnet_naming_rule.async_methods_end_in_async.style = suffix_async
+dotnet_naming_rule.async_methods_end_in_async.severity = suggestion
+dotnet_naming_symbols.async_methods.applicable_kinds = method
+dotnet_naming_symbols.async_methods.required_modifiers = async
+dotnet_naming_style.suffix_async.required_suffix = Async
+dotnet_naming_style.suffix_async.capitalization = pascal_case
+
+dotnet_naming_rule.parameters_are_camel_case.symbols = parameters
+dotnet_naming_rule.parameters_are_camel_case.style = camel_case
+dotnet_naming_rule.parameters_are_camel_case.severity = suggestion
+dotnet_naming_symbols.parameters.applicable_kinds = parameter
+dotnet_naming_style.camel_case.capitalization = camel_case
+
+dotnet_naming_rule.type_parameters_start_with_t.symbols = type_parameters
+dotnet_naming_rule.type_parameters_start_with_t.style = prefix_type_parameter_with_t
+dotnet_naming_rule.type_parameters_start_with_t.severity = suggestion
+dotnet_naming_symbols.type_parameters.applicable_kinds = type_parameter
+dotnet_naming_style.prefix_type_parameter_with_t.required_prefix = T
+dotnet_naming_style.prefix_type_parameter_with_t.capitalization = pascal_case
+
+# Active GenLauncherGO architecture code follows these conventions as
+# build-enforced warnings or errors.
+[GenLauncherGO.*/**.cs]
+csharp_style_namespace_declarations = file_scoped:warning
+csharp_prefer_braces = true:warning
+csharp_style_var_for_built_in_types = false:warning
+csharp_style_var_when_type_is_apparent = true:warning
+csharp_style_var_elsewhere = false:warning
+dotnet_style_readonly_field = true:warning
+dotnet_style_require_accessibility_modifiers = for_non_interface_members:warning
+dotnet_naming_rule.types_are_pascal_case.severity = error
+dotnet_naming_rule.interfaces_start_with_i.severity = error
+dotnet_naming_rule.members_are_pascal_case.severity = error
+dotnet_naming_rule.non_private_fields_are_pascal_case.severity = error
+dotnet_naming_rule.private_fields_are_camel_case.severity = error
+dotnet_naming_rule.constants_are_pascal_case.severity = error
+dotnet_naming_rule.async_methods_end_in_async.severity = error
+dotnet_naming_rule.parameters_are_camel_case.severity = error
+dotnet_naming_rule.type_parameters_start_with_t.severity = error
+dotnet_diagnostic.IDE1006.severity = error
+dotnet_diagnostic.IDE0130.severity = warning
+
+# Keep intentional XML documentation valid. Documentation is required for
+# cross-project contracts and non-obvious behavior, side effects, invariants,
+# safety rules, or platform constraints—not every self-explanatory member.
+dotnet_diagnostic.CS1570.severity = warning
+dotnet_diagnostic.CS1572.severity = warning
+dotnet_diagnostic.CS1573.severity = warning
+
+[*.xaml]
+indent_size = 4

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build-and-test:
+    name: Build, test, and publish
+    runs-on: windows-2022
+    timeout-minutes: 20
+    env:
+      DOTNET_CLI_TELEMETRY_OPTOUT: true
+      DOTNET_NOLOGO: true
+      GENLAUNCHERGO_REQUIRE_SYMBOLIC_LINK_TESTS: true
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v6
+
+      - name: Set up .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: 10.0.3xx
+          dotnet-quality: ga
+
+      - name: Verify .NET SDK
+        shell: pwsh
+        run: |
+          $sdkVersion = dotnet --version
+          if (-not $sdkVersion.StartsWith("10.")) {
+            throw "Expected a .NET 10 SDK, but dotnet selected $sdkVersion."
+          }
+
+      - name: Restore
+        run: dotnet restore .\GenLauncherGO.sln
+
+      - name: Build
+        run: dotnet build .\GenLauncherGO.sln --configuration Release --no-restore
+
+      - name: Test
+        run: dotnet test .\GenLauncherGO.sln --configuration Release --no-build --no-restore
+
+      - name: Publish supported single-file executable
+        shell: pwsh
+        run: |
+          $publishDirectory = Join-Path $env:RUNNER_TEMP "GenLauncherGO-publish"
+          dotnet publish .\GenLauncherGO.UI\GenLauncherGO.UI.csproj -p:PublishProfile=WinX64SelfContained --output $publishDirectory
+          $launcherPath = Join-Path $publishDirectory "GenLauncherGO.exe"
+          if (-not (Test-Path -LiteralPath $launcherPath -PathType Leaf)) {
+            throw "Expected the supported launcher executable at $launcherPath."
+          }
+          $looseLibraries = @(Get-ChildItem -LiteralPath $publishDirectory -Filter "*.dll" -File -Recurse)
+          if ($looseLibraries.Count -ne 0) {
+            throw "The supported single-file publish unexpectedly produced loose DLL files."
+          }