Assistant message tiers

[ethanpalm]

Documentation changes

This PR updates the assistant docs based on recent updates to assistant message tier billing.

Closes

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
• Links resolve to the right destinations
• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
• Steps are in logical order
• Nothing important is missing
• Examples help illustrate the concepts

✅ User experience

• A new user could follow these docs successfully
• Common gotchas or edge cases are addressed
• Error messages or troubleshooting guidance is helpful

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Note

Updates assistant documentation to reflect new billing model and management UI.

• Documents tiered message allowances with carryover and defines what counts as a message
• Clarifies that overages are allowed by default and can be disabled; adds guidance on costs and availability when limits are reached
• Rewrites management copy to point to Assistant Configurations pages and simplifies configuration instructions
• Refines billing section with updated upgrade/downgrade effects (immediate allowance updates, proration, no carryover on downgrade)
• Removes outdated configuration screenshots/frames and adjusts terminology for consistency

^{Written by Cursor Bugbot for commit fbe8c8c. This will update automatically on new commits. Configure here.}

[ethanpalm]

The broken link checker is for the removed images in translated files. It will be fixed when the localization bot runs after this PR is merged.

[mayankshouche]

just one thing I'd like to change!

[tembo]

Minor wording tweak: the last sentence reads like overage charges apply even when overages are disabled. Suggest scoping it to the enabled case.

Suggested change

By default, the assistant allows overages. You can disable overages to avoid incurring additional costs for usage beyond your tier. If you reach your message allowance and have overages disabled, the assistant is unavailable until your message allowance resets. Each additional message incurs an overage charge, but occasional overages may be cheaper than upgrading to a higher tier depending on your usage.

By default, the assistant allows overages. You can disable overages to avoid incurring additional costs for usage beyond your tier. If you reach your message allowance with overages disabled, the assistant is unavailable until your message allowance resets. When overages are enabled, each message beyond your allowance incurs an overage charge, but occasional overages may be cheaper than upgrading to a higher tier depending on your usage.