[dylanjeffers]

First of five PRs that re-ship #14665 on current main, ordered from lowest to highest risk. Each one is branched off main and they don't depend on each other.

What's in it

Code removal and type/comment cleanup only. Nothing here should change runtime behavior.

sdk (internal files only, nothing exported from the package entry point)

• Delete unused utils/deepPartial, utils/localStorage, utils/object, utils/uuid.
• Delete unused getNStorageNodes; isNodeHealthy moves to its own file unchanged.
• EntityManagerClient uses the existing wait() helper.
• Comments and one error string say "validator node" instead of discovery/content node. generatePreview now throws No validator node available. The relay quote error names the right param (audioInputAmount).

harmony

• Delete unused FilterButtonKeyHandler (not exported) and an empty useEffect in FollowButton.
• findAncestor is just el.closest(). The fallback was for browsers without closest.

common

• Delete unused files: useUpdateCollection, useUnfollowUser, usePremiumTracks, reactions/utils, models/Activity, the empty formatTrackTimestamp.
• Delete about 40 unused exports (adapters, saga helpers, selector helpers, string/format/uid/url utils, jupiter addTransferToUserBankInstructions and isDirectRouteAvailable, AUDIO balance sagas, and others).
• Replace @ts-ignores with types in the notification adapter, useInstanceVar, commonPasswordCheck and useUSDCTransactions (Object.assign onto the same result object, as before).
• Comment cleanup: commented-out saga list, stale TODOs, validator node terminology.

mobile

• Skip/restart constants shared between AudioPlayer and NowPlayingDrawer in components/audio/constants.ts.
• Remove 10 @ts-ignores that are no longer needed, and some dead comments.

web

• Delete unused useScript; fix the hooks README.
• Terminology in a sign-up comment and the dev tools Healthz description.

Every removed export, file and flag was re-grepped across all packages on current main before deleting.

Why this tier

Deletions of code with no callers, type-only changes and comments. If something is wrong here it fails at compile time, not at runtime.

Dropped from #14665 because main already covers it

• Remote-config keys and the IOS_USDC_PURCHASE_ENABLED, REACT_QUERY_SYNC, COLLAPSED_EXPLORE_HEADER flags: already removed on main (chore: remove dead crypto code, unused deps and unread remote-config keys #14671 and flag cleanups).
• SLIPPAGE_TOLERANCE_EXCEEDED_ERROR in services/Jupiter.ts: already removed.
• sdk SolanaAddressSchema @ts-ignore: main rewrote it with a base58 check.
• Prettier-only reformatting in useTrackPageLineup, WalletClient and storeContext.

Verified

• tsc: sdk and harmony clean. common, mobile and web each show the same errors as origin/main in this checkout, all in untouched files (a vitest type in a common test, SelectablePillField in web, ThemeProvider in mobile).
• eslint on changed files: clean.
• sdk vitest: 31 files, 249 passed, 2 skipped.
• common vitest: 40 of 41 files pass. store/upload/selectors.test.ts (7 tests) fails the same way on origin/main.
• mobile jest: 18 of 18 suites pass.

Not verified

Not run on a device or in a browser.

🤖 Generated with Claude Code

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