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* refactor(frontend): extract placeholder detection utility with unit tests * fix(frontend): pass prompt text directly to onSelectPlaceholder to avoid stale DOM read The onSelectPlaceholder callback was reading textarea.value immediately after textInput.setInput(prompt), but React state updates are async so the DOM had not yet reflected the new value. This caused the placeholder auto-selection to silently fail when the textarea was previously empty. Fix: accept the new text as a parameter instead of reading from the DOM. * fix(frontend): resolve duplicate findSuggestionTemplatePlaceholder identifier After rebasing onto main, the function existed both inline in input-box-helpers.ts (from #3764) and as an import from our new placeholders module, causing TS2300 duplicate identifier errors. - Remove duplicate import in input-box.tsx - Replace inline function in input-box-helpers with re-export from @/core/suggestions/placeholders - Export SUGGESTION_TEMPLATE_PLACEHOLDER_PATTERN from placeholders module * refactor(frontend): remove dead hasUnreplacedPlaceholder export No production call site uses this boolean wrapper — both existing checks need the {start,end} range from findSuggestionTemplatePlaceholder. Drop the function and its two unit tests.