chore: update docs/samples to use the GA model for gemini-2.5-image

[MichaelDoyle]

I got this notice, so it seems its time. :) Separately, I know there is a 3.0 version in preview, so we'll probably need to bump again when that matures?

[gemini-code-assist]

Summary of Changes

Hello @MichaelDoyle, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on aligning the project's documentation and sample applications with the latest stable release of the gemini-2.5-flash-image model. By removing the 'preview' suffix, it ensures that all examples and recommended configurations guide users to the officially released version of the model, reflecting its maturity and readiness for general use.

Highlights

• Model Update: Updated all references to the gemini-2.5-flash-image model from its preview version (-preview) to its General Availability (GA) version across documentation and sample code.
• Dependency Update: The pnpm package manager version was updated from 10.26.0 to 10.27.0 in package.json.

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[gemini-code-assist]

Code Review

This pull request updates documentation and samples to use the GA model gemini-2.5-flash-image instead of the preview version. The changes are straightforward and correctly applied across all files. I've made two minor suggestions to fix table alignment in the updated markdown files for better readability. Regarding your question about the 3.0 version, updating to that in a separate PR would be a good next step.