deslopity deslopity

[Hona]

Summary

• remove the message-part undefined guards and fallback message snapshotting that were added as a Solid transition workaround
• restore the simpler pre-workaround render flow now that dev includes the Solid memo undefined patch from patch solid to try fix memo undefined under transition bug #18338
• keep the real route, e2e, and async session cleanup fixes from fix: lots of desktop stability, better e2e error logging #18300 intact

Testing

• bun typecheck (packages/ui)
• bun typecheck (packages/app)
• bun test:e2e:local -- e2e/projects/workspace-new-session.spec.ts e2e/projects/projects-switch.spec.ts e2e/session/session-model-persistence.spec.ts

[Copilot]

Pull request overview

This PR removes the temporary Solid transition workaround logic in message-part rendering and restores the simpler render flow now that the Solid “memo undefined under transition” fix is available in dev.

Changes:

• Remove the bindMessage(...) snapshotting/undefined-guard workaround and the associated unwrap usage.
• Refactor AssistantParts, AssistantMessageDisplay, and Message rendering back to a more direct Switch/Match-based flow.
• Keep the existing route/e2e/session cleanup behavior intact while simplifying message/part rendering.

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