vetkeys: remove #120 IdbStorage/LocalStorage workaround once icp-js-auth#137 is released

Background

The vetkeys examples currently carry a localhost-only workaround for dfinity/icp-js-auth#120: on localhost they swap the default secure IdbStorage + ECDSA key for LocalStorage + Ed25519, because the default IdbStorage threw InvalidStateError: ... The database connection is closing on Vite dev servers.

The upstream fix is dfinity/icp-js-auth#137 (recovers from force-closed IndexedDB connections + memoizes the storage connection + awaits session hydration before signIn/signOut writes). It has been verified to resolve #120 (bug reproduces on @icp-sdk/auth@8.0.3, gone on the PR branch).

Task

Once #137 is merged and released, in each affected example:

1. Bump @icp-sdk/auth to the release that contains the fix.
2. Remove the #120 workaround — drop the isLocalEnv ? { storage: new LocalStorage(), keyType: "Ed25519" } : {} override (and the now-unused LocalStorage import) so localhost uses the default secure IdbStorage + ECDSA, same as production.

Affected examples (11)

Files containing the workaround (grep -rl "icp-js-auth/issues/120"):

• motoko/vetkeys/basic_bls_signing/frontend/src/main.ts
• motoko/vetkeys/basic_ibe/frontend/src/main.ts
• motoko/vetkeys/encrypted_notes_app_vetkd/frontend/src/store/auth.ts
• motoko/vetkeys/password_manager/frontend/src/store/auth.ts
• motoko/vetkeys/password_manager_with_metadata/frontend/src/store/auth.ts
• rust/vetkeys/basic_bls_signing/frontend/src/main.ts
• rust/vetkeys/basic_ibe/frontend/src/main.ts
• rust/vetkeys/basic_timelock_ibe/frontend/src/main.ts
• rust/vetkeys/encrypted_notes_app_vetkd/frontend/src/store/auth.ts
• rust/vetkeys/password_manager/frontend/src/store/auth.ts
• rust/vetkeys/password_manager_with_metadata/frontend/src/store/auth.ts

(basic_vetkd motoko + rust don't carry the workaround.)

Verify after removal

Log in on a localhost dev server, then exercise reload churn / login-logout cycles — the InvalidStateError must no longer appear, confirming the default IdbStorage path is safe again.

Blocked on dfinity/icp-js-auth#137.

After dfinity/icp-js-auth#137 is released, use the listed 11 affected vetkeys entry points and grep for the #120 workaround. Bump @icp-sdk/auth, remove the LocalStorage/Ed25519 override and unused import, then verify localhost login, reload churn, and login-logout cycles no longer produce InvalidStateError.