fix(useRoomActivity): canonicalize provider_url → providerUrl

[leecalcote]

Summary

BREAKING — public hook parameter rename. The last surviving snake_case prop on sistent's public surface flipped to canonical camelCase per the cluster-wide identifier-naming contract (`meshery/schemas/AGENTS.md`, row 7: TypeScript property is camelCase).

Affected exported surfaces

• `UseRoomActivityParams.provider_url` → `providerUrl`
• `CollaborationConfigParams.provider_url` → `providerUrl`

Internal renames (no public-API impact):

• Function arg / local var renames in `subscribeToRoomActivity` and `useRoomActivity` to match the public field name. No destructuring rename gymnastics.

Downstream coordination

Known downstream consumer:

• `layer5labs/meshery-extensions#4228` — `ExpandedDesignerDrawer` calls `useRoomActivity({ provider_url: ... })` against the snake form. That call was kept on snake during the §21 deferred-slice work precisely because this hook still exposed the snake parameter.

The companion meshery-extensions commit that flips the outer key (provider_url: → providerUrl:) is a one-line rename. It needs to ride in the same release window as this PR — i.e., when this Sistent change ships, the next sistent bump in `layer5labs/meshery-extensions` should land the call-site flip.

Test plan

• `jest` — 29/29 tests pass.
• After merge: bump `@sistent/sistent` in `layer5labs/meshery-extensions` and confirm the call site at `ExpandedDesignerDrawer/index.tsx` is updated to use `providerUrl:` (otherwise `useRoomActivity` won't receive the URL and the collab signaling URL will be empty).
• After merge: bump `@sistent/sistent` in `layer5io/meshery-cloud` if any consumer there uses `useRoomActivity` (none currently — verified via grep, the cloud UI doesn't import this hook).

References

• `meshery/schemas/docs/identifier-naming-migration.md §21.A` — this PR is the "sistent useRoomActivity" line item in the trailing follow-ups.
• `layer5labs/meshery-extensions#4228` — the §21 deferred-slice work that kept the call site on snake pending this rename.

[gemini-code-assist]

Code Review

This pull request refactors the useRoomActivity hook and its associated interfaces and functions by renaming the provider_url property to providerUrl to align with camelCase naming conventions. I have no feedback to provide as there were no review comments to evaluate.

[Copilot]

Pull request overview

This PR updates the public API of the useRoomActivity hook (and related exported config helper) to use canonical camelCase naming by renaming the last remaining snake_case parameter provider_url to providerUrl, aligning the hook’s consumer-facing surface with the broader identifier-naming contract.

Changes:

• Rename UseRoomActivityParams.provider_url → providerUrl.
• Rename CollaborationConfigParams.provider_url → providerUrl and propagate through getCollaborationConfig.
• Update internal argument/variable usage and the useEffect dependency array to the new name.