feat: wire Hugging Face model downloads, web hub viewing, and pull progress drawer

[spelech]

Summary of Changes

1. Hugging Face & CivitAI Web Hub Viewing

• Added \OpenInBrowserCommand\ to both [\HuggingFaceSearchViewModel.cs](file:///C:/Users/Alias/repos/LocalLLMServerManager/LocalLLMServerManager.Shared/ViewModels/HuggingFaceSearchViewModel.cs) and [\CivitaiSearchViewModel.cs](file:///C:/Users/Alias/repos/LocalLLMServerManager/LocalLLMServerManager.Shared/ViewModels/CivitaiSearchViewModel.cs).
• Added \🌐 View on Hub\ button directly onto every model card and modal header in [\HuggingFaceTabControl.axaml](file:///C:/Users/Alias/repos/LocalLLMServerManager/LocalLLMServerManager.Shared/Views/Controls/HuggingFaceTabControl.axaml) and [\CivitaiTabControl.axaml](file:///C:/Users/Alias/repos/LocalLLMServerManager/LocalLLMServerManager.Shared/Views/Controls/CivitaiTabControl.axaml), utilizing \BrowserLauncher.OpenUrl\ cross-platform.

2. Hugging Face Model Weight Downloads

• Extended [\HuggingFaceSearchService.FetchQuantizationsAsync](file:///C:/Users/Alias/repos/LocalLLMServerManager/LocalLLMServerManager.Shared/Services/HuggingFaceSearchService.cs) to inspect and surface not only .gguf\ files, but all primary weight files (.safetensors, .bin, .pt, .onnx).
• Added \📂 Files & Downloads\ button to every Hugging Face model card to open the file selection modal.
• Added \DownloadHfFileCommand\ to stream model weights via /api/hf/download\ into target destination directories resolved via \DownloadManager.ResolveTargetDirectory.
• Added \PullHfGgufInOllamaCommand\ allowing GGUF quantizations to be pulled directly into Ollama using Ollama's HF syntax (\hf.co/{repoId}:{quantTag}).

3. Ollama Model Pull Progress Drawer

• Added missing slide-out \PullProgressDrawer\ to [\MainView.axaml](file:///C:/Users/Alias/repos/LocalLLMServerManager/LocalLLMServerManager.Shared/Views/MainView.axaml) bound to \Ollama.IsPullDrawerOpen.
• Displays real-time model name badge, percentage progress bar, downloaded/total MB label, and real-time status output log stream.
• Added Avalonia headless visual tree test [\MainView_PullProgressDrawer_RendersAndBindsToOllamaPullState](file:///C:/Users/Alias/repos/LocalLLMServerManager/LocalLLMServerManager.Tests/AvaloniaHeadlessInteractionTests.cs) verifying visual tree binding and visibility toggles.

4. Playwright WASM E2E & Visual Tree Audit

• Updated Playwright WASM tab switch coordinates to target Tab 🔒 Fix Command Injection vulnerability in Service Update API #3 (Can I Run It).
• Optimized \AiAssistantTabControl.axaml.cs\ to only query model capabilities when the AI Assistant drawer is opened.
• All 751 tests (including 745 passed and 6 skipped live external tests) are green.
• Verified cleanly against
  pm run lint\ and
  px tsc --noEmit.