fix: support an unquoted string in the front matter

[flowmitry]

No description provided.

[Copilot]

Pull Request Overview

This PR enhances front matter parsing to support unquoted strings and improves YAML output generation by conditionally quoting values only when necessary.

• Adds fallback parsing for front matter that fails standard YAML parsing
• Implements array/sequence support in YAML front matter processing
• Introduces smart quoting logic to avoid unnecessary quotes in generated output

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 3 comments.

File	Description
internal/util/parser.go	Adds fallback parsing for non-YAML front matter and array support
internal/generator/util.go	Introduces quoteIfNeeded function for conditional string quoting
internal/generator/cursor.go	Updates to use smart quoting instead of always quoting strings
internal/generator/copilot.go	Updates to use smart quoting instead of always quoting strings

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