docs: fix MDX/Mermaid build errors in v2 docs

[scarmuega]

Problem

The Starlight docs build (txpipe/docs) fails compiling the v2 docset merged in #950:

[@mdx-js/rollup] Expected the closing tag `</TabItem>` either after the end of `listItem` …
file: …/oura-v2/docs/v2/advanced/stateful_cursor.mdx

Cause & fix

• advanced/stateful_cursor.mdx — a </TabItem> indented two spaces sat directly after a Markdown list. A - list's content-indent is two spaces, so the closing tag was absorbed as a loose list-item paragraph and MDX never saw it. Moving all Tabs/TabItem tags to column 0 with blank lines around the content puts them outside the list. (The other Tabs pages — binary_release, kubernetes — only have fenced code blocks before their closing tags, which parse fine, so they're untouched.)
• how_it_works.mdx — hardened the new Mermaid block to canonical syntax (spaced -. label .-> dotted links, non-reserved node id) so rehype-mermaid's img-svg renderer accepts it.

Verification

Ran a full local astro build of txpipe/docs against this content (deps + Chromium installed for the Mermaid render):

• 195 pages built, build Complete — no MDX errors.
• The diagram rasterizes to an data:image/svg+xml,…aria-roledescription='flowchart' SVG (browser render succeeded).
• All three new pages (how_it_works, quickstart, troubleshooting) render.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Enhanced formatting and spacing in stateful cursor configuration documentation and system flowchart diagrams for improved clarity and readability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 8e80f17d-ed6d-4fd3-b26f-7cbd3a3a66a2

📥 Commits

Reviewing files that changed from the base of the PR and between d7b231a and 69dcb2c.

📒 Files selected for processing (2)

• docs/v2/advanced/stateful_cursor.mdx
• docs/v2/how_it_works.mdx

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📝 Walkthrough

Walkthrough

Two documentation files receive whitespace-only edits. stateful_cursor.mdx gains blank lines around the Memory and Redis TabItem blocks. how_it_works.mdx adjusts spacing and punctuation in the Mermaid flowchart's cursor edge labels. No content, configuration values, or diagram structure changes.

Changes

Documentation Formatting

Layer / File(s)	Summary
Whitespace and diagram formatting cleanup docs/v2/advanced/stateful_cursor.mdx, docs/v2/how_it_works.mdx	Blank lines inserted around Memory and Redis TabItem blocks; Mermaid flowchart edge label spacing/punctuation adjusted on cursor-related connections.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐇 A blank line here, a space tucked there,
The tabs breathe easy, diagrams fair.
No logic changed, no values swapped,
Just tidy prose, all neatly mapped.
The warren's docs look crisp and bright! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically summarizes the main change: fixing MDX/Mermaid build errors in v2 documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/fix-v2-mdx-build

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