2026.8.27-canary.1230

feat(ios): add share to support (#15340)

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## Summary by CodeRabbit

* **New Features**
  * Added iOS sharing for URLs, text, web pages, and images.
* Shared content can be reviewed, titled, and saved to an AFFiNE
workspace.
  * Choose destinations including workspaces, tags, and collections.
* Added previews, attachment handling, import status, retry support, and
success/error feedback.
* Pending shares are processed when AFFiNE opens or returns to the
foreground.
* **Bug Fixes**
* Improved workspace profile handling across different workspace types.
* Onboarding completion is now recorded immediately after successful
sign-in verification.
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Co-authored-by: DarkSky <25152247+darkskygit@users.noreply.github.com>