feat: automatically set default values when editing a lookup type

[voliva]

To improve on #34, this sets a default value for each entry as you're building a type (e.g. extrinsic)

This also solves the issue where if you wanted to leave a vector as empty, you had to add and then remove one element.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
papi-console	Ready	Preview, Comment	May 14, 2026 10:44am

[Copilot]

Pull request overview

Improves the default-value behavior when building lookup types (e.g. extrinsics) by recursively pre-filling nested structures. This builds on issue #34 to reduce the number of clicks needed to construct values, and also lets users keep vectors empty by default instead of requiring add+remove of a placeholder item.

Changes:

• New getDefaultValue recursive helper in src/utils/shape.ts that produces sensible defaults for void/option/sequence/struct/array/tuple/enum (with depth cap of 5).
• Replaces isEnumVoid with getEnumDefaultValue so enum selection initializes nested values, not only void variants.
• Wires the helper into CSequence.addItem and COption toggle so newly-added items / toggled-on options start with computed defaults.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/utils/shape.ts	Adds getDefaultValue recursive helper and replaces isEnumVoid with getEnumDefaultValue.
src/codec-components/EditCodec/CEnum.tsx	Uses getEnumDefaultValue to initialize the value when an enum variant is chosen.
src/codec-components/EditCodec/CSequence.tsx	Uses getDefaultValue(shape.value) instead of NOTIN when adding a new sequence item.
src/codec-components/EditCodec/codec-components.tsx	COption now initializes the inner value via getDefaultValue when toggled on; removes unused NOTIN import.

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