feat: support RDP-specific deep links

[ethanndickson]

Closes #96.

If a coder_app exists on the workspace, where the URL is of the form:
coder://dev.coder.com/v0/open/ws/<workspace>/agent/<agent>/rdp?username=administrator&password=password the URL will be parsed, validated, and an alert opened.
If Open is clicked on the alert, the password will be written to the clipboard, where it can be pasted when prompted.

rdp.mov

We're unable to avoid the entering of the password, as the password field in an .rdp file, even if encrypted properly, is ignored by the macOS Windows RDP app.

The app supports reading credentials from the macOS keychain, and whilst we could create keychain entries, they have to be associated with an RDP config in the app, and there's no way to automate the creation of that config, and then run that config.

Further reading:
https://stackoverflow.com/questions/48713606/how-to-create-rdp-file-on-mac-os-that-allows-auto-login
https://techcommunity.microsoft.com/discussions/azurevirtualdesktopforum/macos-remote-desktop-client-app---automatic-logon-no-credential-prompt/2596451

The above demo was done by adding this app to the template:

resource "coder_app" "connectrdp" {
  agent_id = coder_agent.main.id
  slug = "connectrdp"
  display_name = "Coder Connect RDP"
  url = "coder://dev.coder.com/v0/open/ws/${data.coder_workspace.me.name}/agent/main/rdp?username=Administrator&password=coderRDP!"
  icon = "/icon/terminal.svg"
  external = true
}

[ethanndickson]

• feat: support RDP-specific deep links #147 👈 (View in Graphite)
• feat: send push notifications for invalid coder scheme URIs #146
• chore: add handler and router for coder scheme URIs #145
• main

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[Copilot]

Pull Request Overview

This PR adds support for RDP-specific deep links by parsing and validating a custom URL format and handling credential display and clipboard copy operations for RDP connections. Key changes include:

• Adding deep link parsing and error handling for RDP routes across multiple modules.
• Introducing new error cases such as openError and couldNotCreateRDPURL to better represent RDP failures.
• Extending the menu state with helper functions to find workspaces and agents by name.

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

File	Description
Coder-Desktop/VPNLib/FileSync/FileSyncDaemon.swift	Added a comment explaining the location of FileSync code to work around a linking issue.
Coder-Desktop/VPNLib/CoderRouter.swift	Extended the router with a new error case (openError) and added error handling improvements for RDP routes.
Coder-Desktop/Coder-Desktop/VPN/MenuState.swift	Added helper functions to find agents and workspaces, which are used by the deep link handling.
Coder-Desktop/Coder-Desktop/URLHandler.swift	Updated URL handling to process the RDP route, validate connectivity, and manage credentials and clipboard actions.

Files not reviewed (1)

• scripts/build.sh: Language not supported

[ethanndickson]

Merge activity

• May 11, 10:46 PM EDT: A user started a stack merge that includes this pull request via Graphite.
• May 11, 10:50 PM EDT: Graphite rebased this pull request as part of a merge.
• May 11, 10:50 PM EDT: @ethanndickson merged this pull request with Graphite.