[Website] Center the Playground file-loading message

[adamziel]

The Files pane now makes the boot wait obvious instead of showing a faint loader at the top of an otherwise empty pane.

The pane fills its available height and centers a larger dark spinner with the message “Playground files are still loading…”. The same loading-state component now uses readable 16px text, and a focused test locks the boot-time copy.

Before	After

Tests

• npm exec -- nx test playground-website --testFile=site-tool-panels.spec.tsx
• npm exec -- nx typecheck playground-website
• npm exec -- nx lint playground-website

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates the Files pane loading state to be more prominent and readable while making the “boot wait” state explicit.

Changes:

• Centered and strengthened the pane loading UI (larger spinner, darker color, larger text).
• Adjusted layout CSS so the tools/panes can fill available height for proper vertical centering.
• Updated copy for the Files boot-time loading state and added a focused test locking that text.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/playground/website/src/components/spinner/style.module.css	Makes spinner color configurable via a CSS variable so it can inherit pane text color.
packages/playground/website/src/components/site-manager/site-info-panel/style.module.css	Adjusts flex/layout so tool content can expand and center loading state vertically.
packages/playground/website/src/components/site-manager/site-info-panel/site-tool-panels.tsx	Updates the Files tab boot-time loading message copy.
packages/playground/website/src/components/site-manager/site-info-panel/site-tool-panels.spec.tsx	Adds a test asserting the updated boot-time loading copy; refactors helper to accept a client override.
packages/playground/website/src/components/site-manager/site-info-panel/index.tsx	Adds a class hook for the tools container to support new layout rules.
packages/playground/website/src/components/pane-loading/style.module.css	Improves loading-state styling (color, type size/leading) and wires spinner color to currentColor.
packages/playground/website/src/components/pane-loading/index.tsx	Increases spinner size for better visibility.

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