feat(rooms): add integration rooms provider

[baba-dev]

Summary

• add a rooms state provider under custom/integration to own the mock snapshot and expose state setters
• update the rooms page to consume provider data instead of inline fixtures and adjust desktop/test builds to compile the provider
• extend UI tests to reset the provider and validate integration-fed snapshots update toggle targets

Testing

• idf.py build (fails: command not found in container)
• python tests/ui/test_rooms_page.py (fails: desktop dependencies missing; CMake could not find expected submodules)

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https://chatgpt.com/codex/tasks/task_e_68cd5a35083c83249b2a1ba560481aab

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

[P1] Avoid storing pointers to caller-owned room snapshots

The provider advertises that callers can treat the returned snapshot as provider-owned, but rooms_provider_set_state simply assigns s_current_state to the caller’s pointer without copying or retaining ownership. If an integration builds a rooms_state_t on the stack (as the tests do) or frees/overwrites the structure after the setter returns, subsequent calls to rooms_provider_get_state will read dangling memory and the UI will dereference invalid entities. The provider should allocate or copy the snapshot it owns, or document and enforce that the passed state must outlive the provider.

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