feat(args-builder): sync entrypoints and Args JSON via ceps schema

[Interchouette]

Summary

• Hydrate the Args builder from on-chain entrypoint args when a contract hash resolves, otherwise from the vendored ceps schema-only wasm (CEP-18/78/85/95).
• Prefill builder values from existing Args JSON and write session_args_json back from the in-memory row model on Build.
• Drop CEP-47; add CEP-95 tab wired to ceps schema.

Test plan

• cd www && npx nx run-many --target=test --all --parallel=3 --cloud=false
• Open Args builder with a known contract hash + entrypoint: Custom rows match on-chain args; existing Args JSON values appear
• Upload WASM, no entrypoint, CEP-18 tab: install fields from schema; Build fills Args JSON
• Change entrypoint / edit Args JSON, reopen builder: values stay in sync

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