Adds red text that appears when the VPN fails to start or stop. After anerror, any manual start/stop operation will clear the error.Contributes to#40

- Enables assembly version verification- Enables authenticode verification- Adds local machine registry config options to enable/disable either oftheseCloses#41Closes#45

Contains a gRPC client for mutagen's synchronization API.All required .proto files are vendored using a new script`Update-Proto.ps1`, which finds all required files by scanning `import`directives.The vendored files are modified to add `csharp_namespace` and a MITlicense header from mutagen.Example usage:```csusing var client = new MutagenClient(@"C:\Users\dean\.mutagen");var res = await client.Synchronization.ListAsync(new ListRequest{    Selection = new Selection    {        All = true,    },});foreach (var state in res.SessionStates)    Console.WriteLine(state);```Closescoder/internal#378

`Publish.ps1` now downloads (if unmodified) the necessary mutagen filesfrom our GCS bucket. These files aren't checked into the repo since theyare large, but they will be cached and ignored in the workdir.`mutagen.exe` and `mutagen-agents.tar.gz` will appear in the samedirectory as `wintun.dll` in the install.```powershellPS C:\Users\dean\git\coder-desktop-windows> ls .\publish\buildtemp-1.2.3.4-x64\vpn    Directory: C:\Users\dean\git\coder-desktop-windows\publish\buildtemp-1.2.3.4-x64\vpnMode                 LastWriteTime         Length Name----                 -------------         ------ -----a----         1/03/2025     12:02           5431 LICENSE.WINTUN.txt-a----        10/03/2025     11:58       17964207 mutagen-agents.tar.gz-a----        10/03/2025     11:58       13797376 mutagen.exe-a----         1/03/2025     15:20         427552 wintun.dll```Updating to a new mutagen version is as simple as updating`$mutagenVersion` in `Publish.ps1`.Closes#25

Updates CredentialModel to have an additional state `Unknown` duringstartup while credentials are validated in the background asynchronously(15s timeout).While loading credentials on startup, the tray app shows a loadingmessage.While updating credentials, we now check that the server version fallsin our expected range.The sign in page now uses a WinUI 3 Dialog to show errors.Closes#42

- Adds support for an array of protobuf "entry points" in`Mutagen/Update-Proto.ps1`- Also refactors file modification/writing to be more efficient and tonot include an unnecessary byte order mark and two trailing new lines- Adds Daemon service to `MutagenClient`

Part ofcoder/internal#458

fixescoder/internal#380Adds MutagenController service, which manages the lifecycle of the `mutagen` daemon and exposes methods to query and modify sync sessions.Sync sessions themselves are a placeholder which will need to be filled out and plumbed thru to the actual API. This just handles daemon lifecycle for now.

Adds `TelemetryEnricher` class and interface to enrich the `StartRequest` message with OS, device ID, and version information.Also adds the version to `Publish.ps1` so that it is available in released binaries.

Closes#61

- Adds `PauseSyncSession` and `ResumeSyncSession`- Adds `SyncSessionViewModel` that wraps `SyncSessionModel` and addsview methods (as you cannot access the parent context if you're in a`ItemsRepeater` apparently)- Wires up Initialize, List, Pause, Resume, Terminate and Create in thefile sync UI## TODO:- Prevent the app from loading until mutagen finishes initializing(either successfully or not) (in a different PR)- Add reinitialization logic to mutagen controller (in a different PR)Closes#26Closes#28Closes#29