fix(codegen): support current Bittensor metadata

[itzlambda]

Current Finney metadata now exposes NetUid, TaoBalance, AlphaBalance, and PerU16 as wrapper types, while the public client API still uses u16 and u64. This caused generated calls and storage bindings to fail compilation.

Configure Subxt code generation to substitute those SCALE-compatible wrappers with their underlying primitives. Metadata fetching, caching, and offline fallback behavior are unchanged.

Validated against both current live Finney metadata (337,180 bytes) and bundled offline metadata.

Summary by CodeRabbit

• Bug Fixes
  • Improved compatibility and consistency of generated runtime bindings.
  • Preserved SCALE-compatible primitive representations for selected numeric types, supporting more reliable client interactions.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e81a4420-523c-4bb7-868c-edc0b786c82b

📥 Commits

Reviewing files that changed from the base of the PR and between 99d7dd0 and fd07631.

📒 Files selected for processing (3)

• lightning-tensor/src/app.rs
• lightning-tensor/src/ui/subnets.rs
• lightning-tensor/src/wallet_compat.rs

Walkthrough

The build script configures CodegenBuilder to substitute selected runtime types with u16 or u64 before generating metadata.rs.

Changes

Primitive code generation substitutions

Layer / File(s)	Summary
Configure primitive type substitutions bittensor-rs/build.rs	Imports parse_quote and maps NetUid and PerU16 to u16, plus TaoBalance and AlphaBalance to u64, before metadata generation.

Estimated code review effort: 2 (Simple) | ~10 minutes

Poem

I’m a rabbit hopping through generated code,
Swapping runtime types for a lighter load.
u16 and u64 now neatly align,
Metadata sprouts in a primitive design.
Hop, hop—bindings compile just fine!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is concise and accurately reflects the codegen fix for current Bittensor metadata.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/bittensor-metadata-compatibility

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