fix: add version label to environment cards

[kmendell]

Checklist

• This PR is not opened from my fork’s main branch

What This PR Implements

Fixes:

Changes Made

Testing Done

• Development environment started: ./scripts/development/dev.sh start
• Frontend verified at http://localhost:3000
• Backend verified at http://localhost:3552
• Manual testing completed (describe):
• No linting errors (e.g., just lint all)
• Backend tests pass: just test backend

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Greptile Summary

This PR adds version labels to environment cards on the all-environments dashboard view. The backend is extended to fetch version info alongside the snapshot in a parallel errgroup fan-out, and the frontend replaces per-card individual loadPromise instances with a single centralized environmentBoardStatePromise that resolves all environments at once.

The backend changes are clean — the errgroup pattern is correctly applied, nil-service guards prevent panics in test scenarios, and test coverage addresses the happy path, offline environments, and remote version-fetch failures.

Confidence Score: 5/5

Safe to merge; only a P2 style finding from this review pass.

All new findings from this review are P2 (style/suggestion level). The backend logic is well-structured and tested. Prior-thread concerns are tracked separately and do not block merge.

frontend/src/routes/(app)/dashboard/+page.svelte — debugUpgrade state has no activation path

Prompt To Fix All With AI

This is a comment left during a code review.
Path: frontend/src/routes/(app)/dashboard/+page.svelte
Line: 75

Comment:
**`debugUpgrade` has no activation path**

`debugUpgrade` is declared as a static `$state(false)` with no way to set it to `true` at runtime. Unlike `debugAllGood` — which is derived from page data (`data.debugAllGood ?? false`) and can be toggled via a URL param or the server `load` function — `debugUpgrade` is always `false`. This makes the entire debug-upgrade path in `DashboardAllEnvironmentsView` (the fake version badge, the `debug` prop on `DashboardEnvironmentUpgradeAction`) permanently unreachable in production and during normal development without Svelte DevTools.

Consider deriving it from page data the same way `debugAllGood` is:

```suggestion
	let debugUpgrade = $derived(data.debugUpgrade ?? false);
```

How can I resolve this? If you propose a fix, please make it concise.

_{Reviews (3): Last reviewed commit: "fix: add version label to environment ca..." | Re-trigger Greptile}

[kmendell]

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[kmendell]

• fix: add version label to environment cards #2379 👈 (View in Graphite)
• main

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