fix(ui): fix editing of controls in the UI

[namrataghadi-galileo]

##Summary##
Fixed edit-control modal crashes for template-backed controls that may not include template_values or rendered fields.
The UI now routes any control with template metadata to the template editor instead of falling through to the raw control editor.

##Scope##
User-facing/API changes: Fixes “Something went wrong” when editing sparse/unrendered template controls.
Internal changes: Added defensive template normalization and a regression fixture/test.

Out of scope: Backend API behavior changes.

##Risk and Rollout##
Risk level: low
Rollback plan: Revert the UI changes in the template edit/control edit files and test fixtures.

##Testing##
Added or updated automated tests
Ran make check (not run; UI-only change. Ran targeted UI checks instead.)
Manually verified behavior

Ran:

make ui-typecheck
make ui-lint
make ui-build
Note: Playwright integration tests could not run because local Chromium is missing.

##Checklist##
Linked issue/spec (if applicable)
Updated docs/examples for user-facing changes
Included any required follow-up tasks: install Playwright browsers and run the focused integration test.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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