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
+    },
+    "dotnet-stryker": {
+      "version": "4.16.0",
+      "commands": [
+        "dotnet-stryker"
+      ],
+      "rollForward": false
+    }
+  }
+}

.gitattributes

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+# Line endings are declared in .editorconfig (end_of_line = crlf) and enforced
+# on C# by `dotnet format whitespace`. Without this file the working-tree result
+# depends on each contributor's core.autocrlf setting, so the same checkout can
+# pass locally and fail the format gate in CI.
+#
+# Everything text-like is stored as LF and checked out as CRLF, which matches
+# what the index already contains, so this changes no stored content.
+* text=auto eol=crlf
+
+# Binary assets must never be normalized or diffed as text.
+*.png binary
+*.jpg binary
+*.ico binary

.github/dependabot.yml

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+# Package versions are centralized in Directory.Packages.props, which Dependabot
+# updates in place. Two things here are deliberately not covered and stay manual:
+# the SDK pin in global.json, and the tool pin in .config/dotnet-tools.json.
+#
+# Updates are grouped so a framework arrives as one reviewable pull request
+# rather than one per package. Every pull request still has to clear the full
+# build, which treats style, naming, and code quality violations as errors, so a
+# bump that introduces a new diagnostic will fail until it is dealt with.
+version: 2
+
+updates:
+  - package-ecosystem: nuget
+    directory: "/"
+    schedule:
+      interval: weekly
+      day: monday
+    open-pull-requests-limit: 5
+    commit-message:
+      prefix: chore
+      include: scope
+    groups:
+      avalonia:
+        patterns:
+          - "Avalonia*"
+      serilog:
+        patterns:
+          - "Serilog*"
+      microsoft-extensions:
+        patterns:
+          - "Microsoft.Extensions.*"
+      test-tooling:
+        patterns:
+          - "coverlet.*"
+          - "FluentAssertions"
+          - "Microsoft.NET.Test.Sdk"
+          - "NSubstitute*"
+          - "xunit*"
+
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: weekly
+      day: monday
+    commit-message:
+      prefix: ci
+      include: scope
+    groups:
+      actions:
+        patterns:
+          - "*"

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  DOTNET_CLI_TELEMETRY_OPTOUT: true
+  DOTNET_NOLOGO: true
+  # Normalizes source paths in the produced assemblies, which is what makes the
+  # Deterministic setting in Directory.Build.props reproducible off this machine.
+  ContinuousIntegrationBuild: true
+
+jobs:
+  build-and-test:
+    name: Build, test, and verify coverage
+    runs-on: windows-2025
+    timeout-minutes: 20
+    env:
+      GENLAUNCHERGO_REQUIRE_SYMBOLIC_LINK_TESTS: true
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6
+
+      - name: Set up .NET
+        uses: actions/setup-dotnet@26b0ec14cb23fa6904739307f278c14f94c95bf1 # v5
+        with:
+          global-json-file: global.json
+
+      - name: Restore
+        run: dotnet restore .\GenLauncherGO.sln
+
+      # Style, naming, and code quality rules are `error` in .editorconfig and
+      # run through EnforceCodeStyleInBuild, so the build itself is the primary
+      # gate.
+      - name: Build
+        run: dotnet build .\GenLauncherGO.sln --configuration Release --no-restore
+
+      # Runs the whitespace, style, and analyzer formatters. Not redundant with
+      # the build: whitespace and end-of-line violations are reported here only,
+      # as are style fixers that have no build-time implementation. Configuration
+      # independent, so once is enough.
+      - name: Verify formatting
+        run: dotnet format .\GenLauncherGO.sln --verify-no-changes --no-restore
+
+      - name: Test with coverage backstop
+        run: dotnet msbuild .\eng\coverage.proj -target:Coverage -property:Configuration=Release -property:SkipCoverageBuild=true
+
+  publish-smoke-test:
+    name: Publish smoke test
+    runs-on: windows-2025
+    timeout-minutes: 20
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6
+
+      - name: Set up .NET
+        uses: actions/setup-dotnet@26b0ec14cb23fa6904739307f278c14f94c95bf1 # v5
+        with:
+          global-json-file: global.json
+
+      - 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."
+          }

.github/workflows/dependency-audit.yml

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+name: Dependency audit
+
+on:
+  schedule:
+    # Weekly, so advisory checks run without waiting for a code change.
+    - cron: "0 6 * * 1"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  DOTNET_CLI_TELEMETRY_OPTOUT: true
+  DOTNET_NOLOGO: true
+
+jobs:
+  dependency-audit:
+    name: Dependency audit
+    runs-on: windows-2025
+    timeout-minutes: 15
+
+    # NU1901-NU1904 are downgraded to warnings in Directory.Build.props so that a
+    # newly published advisory cannot fail an unrelated pull request. This job is
+    # the other half of that decision: it fails loudly, on a schedule, so the
+    # findings are acted on rather than merely visible.
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6
+
+      - name: Set up .NET
+        uses: actions/setup-dotnet@26b0ec14cb23fa6904739307f278c14f94c95bf1 # v5
+        with:
+          global-json-file: global.json
+
+      - name: Restore
+        run: dotnet restore .\GenLauncherGO.sln
+
+      - name: Fail on vulnerable packages
+        shell: pwsh
+        run: |
+          $report = dotnet list .\GenLauncherGO.sln package --vulnerable --include-transitive | Out-String
+          Write-Host $report
+          if ($report -match "has the following vulnerable packages") {
+            throw "Vulnerable packages detected. See the report above."
+          }
+
+      - name: Report deprecated packages
+        shell: pwsh
+        run: |
+          $report = dotnet list .\GenLauncherGO.sln package --deprecated | Out-String
+          Write-Host $report
+          if ($report -match "has the following deprecated packages") {
+            throw "Deprecated packages detected. See the report above."
+          }