Do not show debug suggestion when a project can't compile

[thsparks]

Fixes microsoft/pxt-microbit#6372

For text errors, we were able to determine if an error was a compile or runtime error using the presence of a stack trace, but for block errors, there are some that do not prevent running the program but also do not have a stack, so the same method was not as reliable (hence, we just always showed the button).

However, looking more closely, I believe we can determine if it's a run-blocking error based on whether we detect the error in the typescript compile diagnostics or not. With that in mind, I've added a specific preventsRunning flag to errors, which we can now set and use for determining if we should show the debugger suggestion. When we detect a typescript compile error in blocks, we set this to true. If it's a runtime or blocks compilation error, we set it to false. I've switched the monaco errors to use this as well, though the actual behavior is unchanged.

Upload target: https://makecode.microbit.org/app/3b1b8b4f477f1fa3d985f34d8d1728b0a2e88ef2-82f12bc8d0

[Copilot]

Pull Request Overview

This PR adds a new preventsRunning flag to errors so the UI can hide the debug suggestion when compilation errors block execution.

• Introduce preventsRunning in the ErrorDisplayInfo interface.
• Update Monaco and block-based error factories to set preventsRunning appropriately.
• Change the error list UI to only show the debugger suggestion when no error has preventsRunning: true.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
webapp/src/monaco.tsx	Always pass startDebugger and tag JS/TS diagnostics with preventsRunning.
webapp/src/errorList.tsx	Add preventsRunning to ErrorDisplayInfo and update showDebuggerSuggestion logic.
webapp/src/blocks.tsx	Extend block error factory to accept and propagate preventsRunning.

Comments suppressed due to low confidence (2)

webapp/src/errorList.tsx:33

• Consider adding a JSDoc comment to preventsRunning in ErrorDisplayInfo to explain its semantics (i.e., whether the error blocks program execution).

    preventsRunning?: boolean;

webapp/src/errorList.tsx:107

• Add unit tests for ErrorList to verify that the debugger suggestion is hidden when any error has preventsRunning: true and shown otherwise.

        const showDebuggerSuggestion = startDebugger && !pxt.shell.isReadOnly() && !errors.some(e => e.preventsRunning);