feat: universal environment dashboard

[kmendell]

Checklist

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

What This PR Implements

Fixes: #2142

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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I reviewed and edited all AI-generated output:
I ran all required tests and manually verified changes:

Additional Context

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Greptile Summary

This PR implements a new "universal environment dashboard" view that aggregates data across all configured environments. The backend adds a GetEnvironmentsOverview aggregate endpoint that concurrently fetches per-environment snapshots with proper concurrency limits and timeouts, alongside new types and tests. The frontend adds a new dashboard-all-environments-view.svelte component and restructures the dashboard page to support an "all" vs "current" tab view.

Confidence Score: 5/5

Safe to merge — no blocking issues found; all prior review concerns have been addressed.

The critical bugs flagged in previous rounds (auth scheme mismatch, disabled-environment double-counting, magic string) are all resolved. The new backend logic is well-tested and the frontend progressive-loading pattern is sound. The only remaining finding is the unused getDashboardEnvironmentsOverview service method, which is P2 and does not affect correctness.

frontend/src/lib/services/dashboard-service.ts — the getDashboardEnvironmentsOverview method is dead code unless there is an intended consumer not yet in this PR.

Prompt To Fix All With AI

This is a comment left during a code review.
Path: frontend/src/lib/services/dashboard-service.ts
Line: 33-36

Comment:
**`getDashboardEnvironmentsOverview` is never called**

This method is defined here but not imported or called anywhere in the frontend — `dashboard-all-environments-view.svelte` fetches snapshots per-environment via `getDashboardForEnvironment` instead. The corresponding backend endpoint (`/dashboard/environments`) is therefore unreachable from the UI. If the aggregate endpoint is intended for future use or external API consumers, that's fine, but if the plan was for this view to use it, the wiring is missing.

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

_{Reviews (2): Last reviewed commit: "feat: universal environment dashboard" | Re-trigger Greptile}

[kmendell]

• feat: universal environment dashboard #2241 👈 (View in Graphite)
• main

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[kmendell]

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[kmendell]

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This pull request has merge conflicts. Please resolve the conflicts so the PR can stay up-to-date and reviewed.