PR #8285 (global model search) replaced the expert-mode "Manual model"
block positionally with the new GlobalModelSearchPanel, dropping the only
way to type a provider/model pair by hand in expert mode. The supporting
state and handlers (manualModelInput, manualModelError,
manualModelHasDuplicate, handleAddManualModel) survived as dead code, so
neither typecheck nor lint flagged the loss.
Re-render the block above the search panel, unchanged from its pre-#8285
form. Regression guard: tests/e2e/combos-flow.spec.ts "expert mode shows
a single-page combo form with manual model entry", which had been failing
with a 180s timeout on locator.fill for combo-manual-model-input.
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