Improve workspace-chooser notification

[burieberry]

Follow up on #5728

Polish/fix UI for workspace-chooser notification.

Trying to fetch (forced ui state screenshot):

Could not fetch:

Other changes:

• Failure and Warning Icons: make icon sizing follow lucide icon conventions and optimize svg files.
• Add @size variable for loading indicator component
• Update alert component to use the new icons

[github-actions]

Preview deployments

• Host staging preview

• Host production preview

• Boxel UI staging preview

Host Test Results

    1 files      1 suites   1h 43m 0s ⏱️
3 273 tests 3 265 ✅ 7 💤 0 ❌ 1 🔥
3 287 runs  3 278 ✅ 7 💤 1 ❌ 1 🔥

Results for commit e389744.

For more details on these errors, see this check.

Realm Server Test Results

    1 files  ±0      1 suites  ±0   15m 45s ⏱️ + 1m 22s
2 174 tests ±0  2 174 ✅ ±0  0 💤 ±0  0 ❌ ±0 
2 254 runs  ±0  2 254 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 05dbd76. ± Comparison against earlier commit 15e5032.

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

This PR refines the operator-mode workspace chooser’s “unreachable realm servers” notification by improving messaging and adding UI affordances (icon + spinner), and follows through on related Boxel UI icon/loading-indicator updates.

Changes:

• Add a MatrixService.isRetryingUnreachableRealmServers getter to drive updated notice wording and UI state.
• Update workspace-chooser notice to switch icon + text based on retry state, and show a loading spinner while retrying.
• Refresh warning/failure icons and update LoadingIndicator to support @size; adjust Alert to use the updated icons/sizing.

Reviewed changes

Copilot reviewed 7 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/host/app/services/matrix-service.ts	Exposes retry-loop running state for UI consumers.
packages/host/app/components/operator-mode/workspace-chooser/index.gts	Updates unreachable-servers notice copy, icon, and spinner based on retry state.
packages/boxel-ui/src/icons/warning-triangle-filled.gts	Updates icon styling to use CSS variables for colors.
packages/boxel-ui/src/icons/failure-bordered.gts	Updates icon sizing/viewBox and color variable conventions.
packages/boxel-ui/src/components/loading-indicator/index.gts	Adds @size support and simplifies styling/variant handling.
packages/boxel-ui/src/components/loading-indicator/usage.gts	Updates Freestyle usage page to document new args.
packages/boxel-ui/src/components/alert/index.gts	Adjusts icon sizing/markup to align with updated icons.
packages/boxel-ui/raw-icons/warning-triangle-filled.svg	Optimizes raw SVG source.
packages/boxel-ui/raw-icons/failure-bordered.svg	Optimizes raw SVG source and updates size/viewBox.

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[lukemelia]

Approved once green