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Show a popup for input() requests instead of hanging (py-slang#190) (#4084)

* Show a popup for input() requests instead of hanging (py-slang#190)

Wires up Conductor's new receiveInputRequest hook: a handleInputRequest
saga listens for input requests from the runner, shows the existing
PromptDialog popup, and answers via hostPlugin.sendInput. The home tab
and the viz CSE Machine tab share the same evalCodeConductorSaga run,
so this single fix covers both surfaces from the issue.

Also adds isWaitingForInput workspace state, used to suspend the
execTime watchdog while a popup is open so a user typing an answer
doesn't get their run force-stopped mid-prompt.

Points @sourceacademy/conductor at the local checkout (portal:) for
dev while the protocol change there is unreleased; repin to a real
published version once that lands upstream.

* chore: deps update

* Fix uncaught rejection when the input popup is dismissed via onClose

showSimplePromptDialog's underlying promise rejects if the dialog is
dismissed via its onClose path (e.g. clicking outside) rather than a
button response. The inner try/finally in handleInputRequest reset
isWaitingForInput on that path but didn't catch the rejection, so it
escaped the saga's while(true) loop and killed the task permanently -
leaving the runner blocked forever with no way to answer this or any
future input() call. Catch it and send an empty string, same as an
explicit Cancel.

Caught by gemini-code-assist review on PR #4084.

* Repin @sourceacademy/conductor to the published npm 0.6.0

The npm publish for conductor 0.6.0 landed, so the git-tag stopgap
pin isn't needed anymore - back to the normal semver-via-npm-registry
pin this repo used before. Verified: tsc --noEmit clean against the
real published package.

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