Fix: recover the Realm renderer without entering the full-world fallback

[ael-dev3]

Summary

• add an explicit probing/loading/ready/recovering/static-unsupported/failed renderer lifecycle
• recover WebGL context loss in place with bounded restore timeout and a retry surface
• keep post-ready failures out of the illustrated full-world fallback
• stage castle loading with mandatory Compact and optional Balanced/High degradation
• retain camera attestation and durable React selection/inspector state across rebuilds
• replace destructive capability probing with a cached, non-destructive WebGL probe
• add a bounded unsupported-device view, DOM recovery telemetry, design documentation, and lifecycle tests

Verification

• tsc -b
• vitest run (197 files, 1,753 tests)
• vite build

Scope

Frontend renderer recovery only. No SpacetimeDB schema, backend, DNS, deployment, or production changes. The unrelated open README PR remains untouched.

[ael-dev3]

Superseded by #95, which consolidates the reviewed renderer recovery with the final cleanup and compatibility repairs.