fix(desktop): align snapshot refresh status semantics

[Whiteks1]

Summary

• align desktop snapshot refresh labels with the shared idle | ok | degraded | error contract
• stop treating healthy ok snapshots as an implicit waiting state
• add a small node:test regression for the snapshot label and tone mapping

Issue

• Closes desktop(runtime): align snapshot status contract with renderer semantics #361.

Why

• the shared desktop snapshot contract already changed, but the renderer still expected stale ready / loading values
• that let the UI mislabel healthy runtime state without breaking the shell
• this slice restores one truthful vocabulary across the shared model and renderer

Scope

This PR does not:

• refactor broader desktop UX
• change engine/core contracts outside the snapshot boundary
• alter smoke semantics or architecture slices unrelated to snapshot status mapping

Validation

Validated with:

• npm run typecheck
• node --check renderer/app.js
• node --check renderer/modules/tab-renderers.js
• node --test tests/snapshot-status.test.mjs
• npm run smoke:fallback
• PYTHON=C:\Users\marce\Documents\QUANT LAB PERSONAL\quant_lab\.venv\Scripts\python.exe npm run smoke:real-path

Duplication Check

• I searched for an existing issue covering this mismatch.
• I treated the shared snapshot model as the source of truth instead of introducing alternate status names.
• I kept the regression coverage local to the affected desktop runtime mapping.

Compatibility / Risk

• healthy ok snapshots now render as Live instead of falling through to Waiting
• degraded and error remain distinct operator states instead of collapsing into the same branch
• the main risk is only visible-label drift in existing screenshots or expectations, which is the bug being corrected here

Notes

• local smoke:real-path in this clean worktree needed the canonical repo venv via PYTHON=...\.venv\Scripts\python.exe; the slice itself does not change desktop bootstrap rules

[sourcery-ai]

Sorry @Whiteks1, you have reached your weekly rate limit of 500000 diff characters.

Please try again later or upgrade to continue using Sourcery