🧩 Fix: custom components theme+ job cancellation bug + add modals + block config view + generator view

[nicofretti]

Description

• Adds job cancellation checkpoints at 4 critical locations in the pipeline execution flow
• Replaces browser confirm() calls with a custom ConfirmModal component using Radix UI
• Fixes theme synchronization between shadcn and Primer component libraries

Related Issue

• closes 🧩 Fix: theme in the custom components #43

Checklist

• Code follows project style guidelines
• Comments explain "why" not "what"
• Documentation updated (if needed)
• No debug code or console statements
• make format passes
• make pre-merge passes
• PR update from develop branch
• Copilot review run and addressed

[Copilot]

Pull request overview

This PR implements a comprehensive fix for job cancellation logic to prevent background processing from continuing after cancellation, adds a reusable modal component to replace browser confirm dialogs, fixes theme management to use shadcn as the source of truth, and improves the Generator validation workflow.

• Adds job cancellation checkpoints at 4 critical locations in the pipeline execution flow
• Replaces browser confirm() calls with a custom ConfirmModal component using Radix UI
• Fixes theme synchronization between shadcn and Primer component libraries

Reviewed changes

Copilot reviewed 25 out of 27 changed files in this pull request and generated 16 comments.

Show a summary per file

File	Description
tests/test_job_cancellation.py	Comprehensive test suite for job cancellation at various checkpoints
lib/workflow.py	Adds cancellation checks before block execution in normal and multiplier pipelines
lib/job_processor.py	Critical fix to prevent continuing to next seed after inner loop cancellation
frontend/src/components/ui/confirm-modal.tsx	New reusable confirmation dialog component with variants
frontend/src/App.tsx	Refactors theme management to use shadcn as source of truth
frontend/src/pages/Generator.tsx	Removes auto-revalidation, adds manual verify button, improves UX
frontend/src/components/pipeline-editor/BlockConfigPanel.tsx	Fixes Monaco Editor to use controlled value prop with proper sync logic
frontend/src/components/ui/sonner.tsx	Updates theme integration to use resolvedTheme
pyproject.toml	Adds pytest-timeout dependency for test stability

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[Copilot]

Changing Monaco Editor from defaultValue to value prop makes it a fully controlled component, which can cause performance issues and cursor jumping during typing. Monaco Editor is designed to use defaultValue for initialization. The sync logic should handle updates by calling editor.setValue() instead of changing the value prop. Consider reverting to defaultValue and using the editor instance API for updates.