Render a loading indicator upon first invocation.

[RokeJulianLockhart]

Otherwise, no viewport content renders for > 15 s:

Environment

1. Application

   1. winget show ElectronCommunity.ElectronFiddle

   2. Installer:
        Installer Type: exe
        Installer Locale: en-US
        Installer Url: https://github.com/electron/fiddle/releases/download/v0.37.2/electron-fiddle-0.37.2-win32-x64-setup.exe
        Installer SHA256: d83bfeec2e651e52a152450f5bf9905d1e809161f4c8bac62ff754f8c1afeac7
        Release Date: 2025-07-31
        Offline Distribution Supported: true

2. OS

   1. Get-ComputerInfo | Select-Object -Property @(
      	'OsName',
      	'OsOperatingSystemSKU',
      	'OsVersion',
      	'OsBuildNumber'
      ) | Format-List

   2. OsName               : Microsoft Windows 11 Pro
      OsOperatingSystemSKU : 48
      OsVersion            : 10.0.26120
      OsBuildNumber        : 26120

[RokeJulianLockhart]

#1742 (comment)

After waiting and clicking the tour context menu entry, it appears to render now:

Hereafter, it renders. Should this be closed as unplanned/invalid?

[RokeJulianLockhart]

Having since installed it on my Linux laptop, it really does take almost 15 s to load, without any indicator that it is doing so. Consequently, I shall re-open this, and re-scope it.