[Crazy RoboTaxi] Improve results leaderboards UI

[aidanfnv]

Split off from #553

• Show the leaderboard while the player is entering their name.
• Insert a qualifying unsaved result at its final rank with an empty driver name until it is saved.
• Show the existing leaderboard even when the player does not qualify for it.
• Maintain up to 10 entries for both Taxi scores and Race times.
• Highlight the player’s qualifying row.
• Measure leaderboard columns from their headers and displayed values.
• Make the leaderboard at least half the viewport width while preserving the minimum width required by its contents.
• Size the table height from its rows and make the table vertically scrollable when available space is limited.
• Place PLAY AGAIN and RETURN TO MENU side by side on both results screens.
• Support returning to the menu directly from the results screen.

[copy-pr-bot]

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[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge with no outstanding actionable findings.

Summary

The PR improves the Crazy RoboTaxi results screens and leaderboard behavior.

• Displays existing standings while entering a qualifying result and inserts the pending result at its prospective rank.
• Standardizes Taxi and Race leaderboards at ten entries and measures table columns from displayed content.
• Constrains leaderboard height to the available viewport and enables scrolling in limited space.
• Adds side-by-side PLAY AGAIN and RETURN TO MENU actions using the existing menu-return transition.
• Adds gameplay and UI coverage for leaderboard limits, pending rows, constrained layouts, and result actions.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Game or race ends] --> B{Result qualifies?}
    B -->|Yes| C[Show persisted leaderboard plus pending blank-name row]
    C --> D[Save driver name]
    D --> E[Show persisted ranked leaderboard]
    B -->|No| E
    C --> F[Play again or return to menu]
    E --> F

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_{Reviews (8) · Last reviewed commit: "[crazy-robotaxi] Bound initial leaderboa..."}

[aidanfnv]

/ok to test 077ac9a

[aidanfnv]

/ok to test e8018c3