feat(desktop): add launch review and failure flow

[Whiteks1]

Summary

This PR:

• adds shell-native launch review tabs so recent jobs can be inspected without leaving QuantLab Desktop
• introduces failure-oriented commands such as open latest failed launch and explain latest failure
• wires plain-text log loading through Electron IPC so the shell can read stdout and stderr generated by existing QuantLab launch jobs

Why

This slice matters because:

• the desktop shell should support failure review as part of the research loop, not just launching and opening runs
• operators can now inspect job state and understand likely failure causes from one workspace instead of bouncing to browser links and raw files

Scope

This PR does not:

• add AI reasoning or freeform diagnosis beyond deterministic failure summaries
• replace existing browser surfaces for full run inspection; it adds a focused shell-native review path on top of them

Validation

Validated with:

• node --check desktop/main.js
• node --check desktop/preload.js
• node --check desktop/renderer/app.js
• python -m pytest test/test_research_ui_server.py

Notes

• This builds directly on the desktop shell workflow branch by extending the launch -> inspect -> compare loop with launch failure review.
• No issue is closed by this slice.

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