Function updateDailyNoteFrontmatter

src/utils/helpers.ts:971–996

* Updates daily note frontmatter while preserving body content

(
	app: App,
	dailyNote: TFile,
	frontmatter: DailyNoteFrontmatterWithTimeblocks,
	originalContent: string
)

 * Updates daily note frontmatter while preserving body content
 */
async function updateDailyNoteFrontmatter(
	app: App,
	dailyNote: TFile,
	frontmatter: DailyNoteFrontmatterWithTimeblocks,
	originalContent: string
): Promise<void> {
	// Get body content (everything after frontmatter)
	let bodyContent = originalContent;
	if (originalContent.startsWith("---")) {
		const endOfFrontmatter = originalContent.indexOf("---", 3);
		if (endOfFrontmatter !== -1) {
			bodyContent = originalContent.substring(endOfFrontmatter + 3);
		}
	}

	// Convert frontmatter back to YAML
	const frontmatterText = stringifyYaml(frontmatter);

	// Reconstruct file content
	const newContent = `---\n${frontmatterText}---${bodyContent}`;

	// Write back to file
	await modifyVaultFile(app, dailyNote, newContent);

	// Native metadata cache will automatically update
}

/**
 * Filters out empty or whitespace-only project strings