finish phase 4: drop @atproto/api dependency, lex-only errors, delete toLex and legacy validators

oxlint-suppressions.json gains a baseline entry for webpack.config.js: the
file was never previously staged/linted (lint script covers src+modules
only), and editing it exposed its pre-existing violations to lint-staged.
All suppressed counts are pre-existing; this change only removes a line.

src/screens/StarterPack/Wizard/StepProfiles.tsx

@@ -16,7 +16,6 @@ import {ScreenTransition} from '#/components/ScreenTransition'
 import {WizardProfileCard} from '#/components/StarterPack/Wizard/WizardListCard'
 import {Text} from '#/components/Typography'
 import {IS_NATIVE} from '#/env'
-import {type app} from '#/lexicons'
 import type * as bsky from '#/types/bsky'
 
 function keyExtractor(item: bsky.profile.AnyProfileView) {