docs: fix duplicate sidebar order number

[eatse21]

Summary

Fixes duplicate sidebar order numbers in the How-To section. Both customize-bmad.md and project-context.md were set to order: 7, causing ordering conflicts in the sidebar navigation.

Root Cause

• customize-bmad.md → order: 7
• project-context.md → order: 7 (duplicate)

Changes

• Bumped project-context.md sidebar order from 7 → 8
• Bumped shard-large-documents.md sidebar order from 8 → 9
• Applied fix to both English and Chinese (zh-cn) documentation

Test plan

The sidebar elements keep their old "guessed" order, now in a non-conflicting way

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 219b29af-2ef8-4b26-bbed-aefda52e921c

📥 Commits

Reviewing files that changed from the base of the PR and between a092209 and 6c32493.

📒 Files selected for processing (4)

• docs/how-to/project-context.md
• docs/how-to/shard-large-documents.md
• docs/zh-cn/how-to/project-context.md
• docs/zh-cn/how-to/shard-large-documents.md

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📝 Walkthrough

Walkthrough

Documentation navigation ordering updates across English and Chinese documentation files. The sidebar.order values are incremented to adjust page positioning in the sidebar, with no functional or content modifications.

Changes

Cohort / File(s)	Summary
English Documentation docs/how-to/project-context.md, docs/how-to/shard-large-documents.md	Updated sidebar.order from 7→8 and 8→9 respectively to reorder navigation.
Chinese Documentation docs/zh-cn/how-to/project-context.md, docs/zh-cn/how-to/shard-large-documents.md	Updated sidebar.order from 7→8 and 8→9 respectively to reorder navigation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main change: fixing duplicate sidebar order numbers in the documentation.
Description check	✅ Passed	The description clearly explains the issue (duplicate order numbers), the root cause, specific changes made, and testing approach, all directly related to the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

📝 Coding Plan

• Generate coding plan for human review comments

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[alexeyv]

Thank you!