Apply Title Case to inconsistent headings

[mintlify]

Summary

Standardizes H2 headings across the docs to follow the Title Case convention defined in AGENTS.md. The predominant style across pages is Title Case; this PR fixes the remaining sentence-case outliers so headings read consistently across SDK references, integrations, maintenance, and sync docs.

Changes

Updated 26 H2 headings across 15 files. Examples:

• ## Demo app → ## Demo App
• ## Compilable queries → ## Compilable Queries
• ## Encrypted databases → ## Encrypted Databases
• ## Local writes → ## Local Writes
• ## Common issues → ## Common Issues
• ## Database setup / ## PowerSync configuration / ## Data sync / ## Next steps → Title Case equivalents
• ## Configure PowerSync in your project / ## Configure PowerSync in your Project / ## Configuring PowerSync in your React Native for Web project → Title Case equivalents
• ## Get the SQLite file / ## Inspecting the SQLite file / ## Reducing SQLite file size → Title Case equivalents
• ## Storage version / ## Supported fixes → Title Case equivalents
• ## Generate a scoped JWT token / ## Pre-seeding script → Title Case equivalents
• ## Sharing a database with Rust code → ## Sharing a Database with Rust Code
• ## Add the PowerSync Attachments Helper to your project / ## Create a Custom Component to display and upload photos / ## Add the \ListImage` Custom Component to your page` → Title Case equivalents
• ## Technical details / ## Client logging → Title Case equivalents

Notes

• No technical content, code samples, or API references were modified.
• Anchor links remain valid: Mintlify lowercases heading text when generating anchors, so existing internal links to these sections still resolve.
• mint validate and mint broken-links both pass.

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Project	Status	Preview	Updated (UTC)
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