test: cover time and datetime-local locator fills

[HaoChiBao]

Summary

• Extend locator fill coverage for time and datetime-local inputs alongside the existing date case (issue Fill on <input type="date"> and <input type="time"> confirmed not working #1249).
• Add matching RPC smoke fixture coverage so the value-setter path is asserted end-to-end.

Test plan

• pnpm --filter @browserbasehq/stagehand exec vitest run packages/sdk-ts/tests/integration/locatorFill.test.ts
• pnpm --filter @browserbasehq/stagehand-protocol exec vitest run packages/protocol/tests/browser-runtime/rpc-client-smoke.test.ts
• Confirm fills persist via inputValue() for date, time, and datetime-local

Closes #1249

---

Summary by cubic

Extends test coverage to verify Locator.fill for time and datetime-local inputs and exercises the RPC value-setter path end-to-end. Previously only date was covered; now all three are filled and persist even when beforeinput blocks insertText.

• Integration: parameterized test in packages/sdk-ts/tests/integration/locatorFill.test.ts covers date, time, and datetime-local via the value setter under a blocked insertText path.
• RPC smoke: fills and reads back #locator-date, #locator-time, and #locator-datetime-local; adds these inputs to the fixture HTML in packages/protocol/tests/browser-runtime/rpc-client-smoke.test.ts.
• Test-only change; no runtime behavior impact. Completes the remaining input types from Fill on <input type="date"> and <input type="time"> confirmed not working #1249.

^{Written for commit d65d5a1. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

Architecture diagram

sequenceDiagram
    participant Test as SDK Integration Test
    participant Page as Playwright Page
    participant RPC as RPC Client(s)
    participant Runtime as Browser Runtime
    participant DOM as DOM Input Element
    
    Note over Test,DOM: Locator Fill Flow for Date/Time/Datetime-local
    
    Test->>Page: goto(data URL with input + beforeinput blocker)
    Test->>Page: locator("xpath=/html/body/input")
    Test->>RPC: locatorFill(pageId, selector, value)
    RPC->>Runtime: activeRpcClient.send(locatorFill)
    Runtime->>Runtime: Identify input type (date|time|datetime-local)
    alt insertText blocked by beforeinput handler
        Runtime->>DOM: Set value directly via value setter
        DOM-->>Runtime: input value updated
    else insertText allowed (no blocker)
        Runtime->>DOM: Dispatch insertText input event
    end
    Runtime-->>RPC: { filled: true }
    RPC-->>Test: Fill confirmed
    
    Note over Test,DOM: Verification Flow
    
    Test->>RPC: locatorInputValue(pageId, selector)
    RPC->>Runtime: activeRpcClient.send(locatorInputValue)
    Runtime->>DOM: Read current value
    DOM-->>Runtime: value string
    Runtime-->>RPC: date|time|datetime-local value
    RPC-->>Test: Input value matches expected
    
    Note over RPC,DOM: RPC Smoke Test Flow (protocol package)
    
    Test->>RPC: locatorFill for #locator-date, #locator-time, #locator-datetime-local
    RPC->>Runtime: Send fill commands with values
    Runtime->>DOM: Set values on fixture inputs
    DOM-->>Runtime: Confirm fills
    Runtime-->>RPC: { filled: true }
    Test->>RPC: locatorInputValue for each input
    RPC->>Runtime: Read back values
    Runtime-->>RPC: Return values
    RPC-->>Test: Assert values persist (2026-07-21, 14:30, 2026-07-21T09:15)

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_{Re-trigger cubic}