[API] Refactor UserInputEventData into UserInputEvent, add validation for uniqueness of event type

[ArielG-NV]

Resolves: #501

Goal: clean up UserInputEvent and shim UserInputEventData
Changes:

• Remove UserInputEventData in-favor for UserInputEvent
• Add validation that a UserInputEvent class-type is unique

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[greptile-apps]

Greptile Summary

The PR replaces wrapped UserInputEventData values with timestamped concrete UserInputEvent subclasses and validates event-type-name uniqueness during subclass creation.

• Migrates runtime, WebRTC, UI routing, integrations, and tests to concrete event objects.
• Moves timestamp assignment into concrete WebRTC event construction.
• Renames the internal SlangPy renderer module and updates its consumers.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains.

No blocking failure remains.

Important Files Changed

Filename	Overview
flashdreams/flashdreams/api_v2/user_input_event.py	Introduces the timestamped abstract event base and process-wide event-type-name uniqueness validation.
flashdreams/flashdreams/runtime_v2/user_input_event.py	Converts each runtime event-data class into a concrete timestamped event subclass.
flashdreams/flashdreams/runtime_v2/serving/webrtc_server.py	Constructs and timestamps concrete browser events before buffering them.
flashdreams/flashdreams/runtime_v2/session_runner.py	Updates lifecycle-event detection to inspect concrete event instances.
flashdreams/flashdreams/runtime_v2/slangpy_ui_renderer.py	Renames the renderer module and routes keyboard and mouse fields directly from concrete events.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
    B[Browser or client input] --> C[Concrete UserInputEvent with timestamp]
    C --> E[EventBuffer]
    E --> U[UI event routing]
    E --> M[Model session step]
    C --> L{Close or reset event?}
    L -->|Close| S[Stop session]
    L -->|Reset| R[Reset session generation]

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_{Reviews (2): Last reviewed commit: "pre commit" | Re-trigger Greptile}

[ArielG-NV]

/ok to test 5aa15a9

[ArielG-NV]

/ok to test 19b47c6