Add SEO descriptions to timeseries and event catalog pages

[mintlify]

Summary

Audited all 538 MDX files for SEO and metadata quality. Found 243 pages missing a description frontmatter field after the most recent auto-regeneration of the event catalog and timeseries endpoint docs overwrote previously-added descriptions.

This PR restores concise, plain-language descriptions (all between 50 and 160 characters) to each of those pages. Descriptions were sourced from the previously-approved versions in PRs #823 and #825.

What changed

• Added description frontmatter to 51 timeseries API reference pages under api-reference/data/timeseries/ (e.g. afib-burden.mdx, glucose.mdx, heartrate.mdx). Each follows the existing API reference style: "Retrieve [metric] timeseries data for a specific user, grouped by source provider."
• Added description frontmatter to 192 webhook event reference pages under event-catalog/ (e.g. daily.data.activity.created.mdx, historical.data.heartrate.created.mdx, provider.connection.created.mdx). Each summarizes in plain language when the event fires and what it represents.
• Only frontmatter was modified — no page content was changed.

Not changed

• 10 files in snippets/ have no frontmatter, but these are reusable fragments imported into other pages (not rendered as standalone pages), so frontmatter is not applicable.
• No pages had titles exceeding 60 characters, descriptions shorter than 50 characters, or descriptions longer than 160 characters.

Validation

• mint validate — build validation passed
• mint broken-links — no broken links found

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