fix(agent-installer): resolve raw localization keys in custom dialog labels

[irvingouj@Devolutions (irvingoujAtDevolution)]

Split out of #1831 (draft tracker — the TODO(agent-tunnel) marker is placed at the exact code site; not fixed yet).

Custom installer dialog labels show raw localization keys

Symptom: The Agent Tunnel dialog (and the base dialog title) render literal keys — AgentTunnelDlgTitle, AgentTunnelDlgEnrollmentStringLabel, AgentDlg_Title, … — instead of the translated text.

Root cause: The strings exist correctly in Strings_*.json and DevolutionsAgent_*.wxl. At runtime Project_UIInitialized loads the embedded .wxl into a local dict that only feeds the pre-flight MessageBoxes. The custom dialogs resolve [Key] via MsiRuntime.Localize, which is not populated from these custom strings — light.exe only emits strings referenced via !(loc.X) into the MSI, and the custom [Key] labels are never !(loc.X)-referenced (verified via dark.exe: the strings are absent from the built MSI's localization tables). Standard dialogs (Welcome/InstallDir) work only because WixSharp's built-in UI references those standard IDs via !(loc.X).

Suggested fix: wire the loaded strings dict into the ManagedUI runtime localization (or back the custom dialogs with a shared I18n that reads it). TODO(agent-tunnel) marker in Program.cs.

[github-actions]

Let maintainers know that an action is required on their side

• Add the label release-required Please cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module) when you request a maintainer to cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module)

• Add the label release-blocker Follow-up is required before cutting a new release if a follow-up is required before cutting a new release

• Add the label publish-required Please publish libraries (`Devolutions.Gateway.Utils`, OpenAPI clients, etc) when you request a maintainer to publish libraries (Devolutions.Gateway.Utils, OpenAPI clients, etc.)

• Add the label publish-blocker Follow-up is required before publishing libraries if a follow-up is required before publishing libraries