Sync from docs: mark Capacitor SDK as beta (powersync-docs #477)

[bean1352]

Generated by Claude. Review carefully before merging.

Source docs PR: powersync-ja/powersync-docs#477

What changed in docs

The Capacitor SDK was promoted from alpha to beta across all docs pages, with the stability language updated to reflect that the SDK is production-ready for tested use cases (the Capacitor Community SQLite driver portion is no longer described as experimental).

Skill updates in this PR

• skills/powersync/references/sdks/powersync-js.md — Updated the Package Coverage table to label the Capacitor entry as (beta), reflecting its promoted maturity status.

Notes for reviewer

• No existing skill file contained an explicit "alpha" label for Capacitor, so there is no incorrect text to correct — only the maturity annotation in the Package Coverage table was missing.
• There is no dedicated powersync-js-capacitor.md reference file, and Capacitor does not appear in the SKILL.md JS/TS SDK framework table. Now that the SDK is beta, a dedicated reference file (covering Capacitor-specific setup, the @capacitor-community/sqlite driver, and known limitations) may be worth adding. Flagging as a gap for the reviewer to decide.
• The docs also updated the warning text to clarify that the Web SDK–derived functionality is stable while the SQLite driver portion is "production-ready for tested use cases." This nuance is not reflected in the current skill; the reviewer may want to add a note about known limitations in a future Capacitor reference file.

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Generated by Claude Code

[benitav]

Unnecessary.