chore: integrate feature branches into local_main

[danhilse]

This PR aggregates the following branches from the fork into a single integration branch:

• feature/batch-copy-markdown (feat(files): multi-select + bulk Copy Markdown; support folders (with '# Folder: <name>' headers); toasts and dedupe #525)
• feature/note-timestamps (feat(files): add persisted date visibility toggle (calendar icon) in Files sidebar; IPC handlers and preload wiring #526)
• feature/qol-sidebar-actions (chore(nav): remove New Note and New Directory buttons from nav (moved to Files sidebar header) #527)
• chore/update-claude-sonnet-4-20250514 (feat(anthropic): update default cloud model to claude-sonnet-4-20250514 #528)

Conflict resolutions:

• FileItemRows.tsx: merged multi-select selection logic with date display.
• FileSidebar.tsx: combined New Note/New Folder actions with date-visibility toggle.

[greptile-apps]

Greptile Summary

This PR integrates four feature branches into a single integration branch, combining significant enhancements to file management, UI improvements, and model updates. The changes include:

Multi-select and Batch Operations: Adds comprehensive multi-select functionality to the file sidebar with support for Ctrl/Cmd and Shift key combinations. Users can now select multiple files and perform bulk "Copy Markdown" operations, including intelligent folder content aggregation with proper header formatting and deduplication logic.

Note Timestamps Feature: Introduces a new NoteTimestamps component that displays file creation and modification dates directly in the editor interface. The component allows users to toggle between creation and modification timestamps with keyboard accessibility support, providing temporal context for notes.

Sidebar Quality-of-Life Improvements: Relocates "New Note" and "New Directory" action buttons from the main navigation sidebar to the Files sidebar header for better contextual placement. Adds a persistent date visibility toggle (calendar icon) that allows users to show/hide file modification dates in the sidebar, with preferences stored in the electron store across sessions.

Model Upgrade: Updates the default Anthropic model from claude-3-5-sonnet-latest to claude-sonnet-4-20250514, upgrading to the newer generation Claude Sonnet 4 model while switching from an alias to a specific version snapshot for better consistency.

Infrastructure Updates: Extends the electron store schema with new IPC handlers for file date visibility preferences, adds proper preload layer exposure for secure cross-process communication, and updates .gitignore to exclude user-customizable agent configuration files.

The integration involved careful conflict resolution, particularly merging the multi-select logic with date display in FileItemRows.tsx and combining action buttons with the date toggle in FileSidebar.tsx. The changes maintain backward compatibility while adding these power-user features through the existing FileContext architecture.

Confidence score: 4/5

• This PR introduces substantial new functionality but appears well-architected with appropriate separation of concerns and follows existing patterns
• Score reflects the complexity of integrating multiple features simultaneously, though individual changes appear solid
• Pay close attention to FileContext.tsx performance optimization and FileItemRows.tsx multi-select logic complexity

_{11 files reviewed, 2 comments}

_{Edit Code Review Bot Settings | Greptile}

[greptile-apps]

logic: Missing preventDefault() call for space key to prevent page scrolling

Suggested change

	if (e.key === 'Enter' || e.key === ' ') setShowUpdated((prev) => !prev)
	if (e.key === 'Enter' || e.key === ' ') {
	e.preventDefault()
	setShowUpdated((prev) => !prev)
	}

[greptile-apps]

logic: Missing cleanup for IPC listener - this will cause memory leaks. Add return statement to remove the listener on unmount.

Suggested change

	useEffect(() => {
	const init = async () => {
	const val = await window.electronStore.getFileIndexDateVisibility()
	setShowDates(val)
	}
	init()
	const handler = (_e: any, val: boolean) => setShowDates(val)
	window.ipcRenderer.on('file-index-date-visibility-changed', handler)
	}, [])
	useEffect(() => {
	const init = async () => {
	const val = await window.electronStore.getFileIndexDateVisibility()
	setShowDates(val)
	}
	init()
	const handler = (_e: any, val: boolean) => setShowDates(val)
	window.ipcRenderer.on('file-index-date-visibility-changed', handler)
	return () => {
	window.ipcRenderer.off('file-index-date-visibility-changed', handler)
	}
	}, [])