perf: merge three backend calls into one

[barredterra]

No description provided.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Sequence Diagram

sequenceDiagram
    participant User
    participant Browser as Docs Browser
    participant API as get_view
    User->>Browser: Navigate or switch locale
    Browser->>Browser: Increment _view_seq
    Browser->>API: Request tree, page, and variants
    API-->>Browser: Combined view payload
    Browser->>Browser: Compare request sequence
    alt Response is current
        Browser->>Browser: Apply tree, page, variants, and route
    else Response is stale
        Browser->>Browser: Discard response
    end

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