refactor(site): replace leftover MUI form controls inside dialogs - #27523

The dialog de-MUI branch had accidentally downgraded vite from 8.0.16 to
8.0.10 (with the corresponding pnpm-lock churn) via an unrelated change.
Restore site/package.json and site/pnpm-lock.yaml to match main.

…ponent

Replace hand-rolled inline { open; onOpenChange? } / { open; onClose } prop
types with composition of the underlying dialog's props:
- TaskFeedbackDialog composes ComponentProps<typeof Dialog>.
- UpdateBuildParametersDialog and MissingTemplateVariablesDialog compose
  MUI DialogProps, matching the components they still render.

This restores the prior DialogProps-style composition and forwards the full
dialog prop surface instead of a fixed subset.

- Stop exporting ConfirmDialogType; it is only used within ConfirmDialog,
  and the dangling export failed knip (lint job).
- Update the WorkspacePage orphan-on-delete test to select the orphan
  checkbox by test id. The migrated radix Checkbox sets the test id on the
  role=checkbox button itself, so the previous within(...).getByRole did not
  match (test-js job).

UpdateBuildParametersDialog and MissingTemplateVariablesDialog were the only
remaining users of MUI Dialog in site/src. Port them to the internal Dialog
primitives (DialogContent/Header/Title/Description/Footer + Button), keeping
the form submit semantics, the loading state, and the public
{ open, onClose, ... } API so call sites are unchanged. radix now wires
aria-labelledby/aria-describedby from the title/description, removing the
duplicated update-build-parameters-title id.

Revert the earlier 8.0.16 restore. vite 8.0.16 breaks the local dev site;
8.0.10 is the working version for this branch. The 8.0.16 bump is handled
on a separate branch.

Restore site/package.json and site/pnpm-lock.yaml to match main. The vite
version bump is handled on a separate branch and does not belong in the
dialog migration.

…oxes

Constrain the migrated parameter dialogs to the viewport and make their
form regions scrollable so the footer stays reachable for long parameter
and variable lists.

Feed the schedule dialog checkboxes their checked state so the check
icon reflects the selection, and add interaction coverage that exercises
the prevention options, submit, and cancel flows.

Swap the Material UI TextField, Checkbox, and FormControlLabel that still
lived inside migrated dialogs for the internal Input, Label, Textarea,
FormField, and Checkbox primitives:

- FileDialog (create/rename): Input + Label + inline error text.
- AnnouncementBannerDialog: Textarea + helper text.
- PublishTemplateVersionDialog: FormField for the name, Textarea for the
  message, and the internal Checkbox for the promote toggle. Drop the stale
  disablePortal workaround now that the shell is radix, not MUI.
- SingleSignOnSection: the in-dialog confirm-password field uses Input +
  Label + inline error.

Port the AnnouncementBannerDialog story to fn() with a message-edit
interaction.