feat: add base-sepolia network and corresponding USDC token entry

[rodrigopavezi]

Summary by CodeRabbit

• New Features

  • Added support for the Base Sepolia network.
  • Added USDC token on Base Sepolia.

• Chores

  • Bumped token list version to 2.x and updated timestamp.

• Documentation

  • Clarified “Adding a New Token” instructions, expanded major-version wording about breaking changes, and added guidance not to edit autogenerated version files.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Adds "base-sepolia" network support: schema enum updated, NetworkType and CHAIN_IDS extended with "base-sepolia" / 84532, token list version/timestamp bumped, and a new USDC token entry for network base-sepolia added.

Changes

Cohort / File(s)	Summary
Schema & Types src/schemas/token-list-schema.json, src/types/index.ts	Added "base-sepolia" to the network enum in the token schema; added BASE_SEPOLIA = "base-sepolia" to NetworkType and added "base-sepolia": 84532 to CHAIN_IDS.
Token List Data tokens/token-list.json	Bumped version and timestamp; appended a new USDC token entry with network: "base-sepolia" and chainId: 84532.
Documentation README.md	Clarified "Adding a New Token" step, refined wording for Major version note, split/expanded notes about timestamps and autogenerated version files, and minor formatting tweaks.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

• Areas to check:
  • Exact string consistency of "base-sepolia" across schema, types, and token entry.
  • Correctness and intended usage of chain ID 84532 in CHAIN_IDS and the token object.
  • Token metadata fields (address, decimals, hash, id) match existing conventions and formatting.

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main changes: adding base-sepolia network support and a USDC token entry for that network.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/usdc-base-sepolia

---

📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between d039afe and e3da517.

📒 Files selected for processing (1)

• README.md (1 hunks)

✅ Files skipped from review due to trivial changes (1)

• README.md

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}