fix: remove unused imports and variables flagged by eslint

Resolve 21 pre-existing @typescript-eslint/no-unused-vars errors across
5 files (actions.ts, alert.ts, digest.ts, env.ts, worker/email.ts) that
were blocking the script/checks gate. All removals are unused imports
and unused variable assignments with no runtime impact.

src/actions.ts

@@ -1,6 +1,4 @@
 import { instrument } from 'succinct-async'
-import type { Subscription } from './alert.js'
-import { getCronExpression } from './alert.js'
 import * as mailer from './mailer.js'
 import * as worker from './worker/index.js'
 import * as db from './database.js'

src/alert.ts

@@ -1,6 +1,3 @@
-import { CronExpressionParser } from 'cron-parser'
-import { tryCatch, int, HOUR } from '@welshman/lib'
-
 export type Subscription = {
   id: string
   key: string

src/digest.ts

@@ -1,36 +1,27 @@
 import { neventEncode, decode } from 'nostr-tools/nip19'
 import {
   spec,
-  now,
   sortBy,
   groupBy,
   displayList,
-  nth,
-  nthEq,
-  dateToSeconds,
   secondsToDate,
 } from '@welshman/lib'
 import { parse, truncate, renderAsHtml } from '@welshman/content'
 import {
   TrustedEvent,
   getParentId,
-  getIdFilters,
-  getReplyFilters,
   NOTE,
   COMMENT,
   REACTION,
   displayProfile,
   displayPubkey,
 } from '@welshman/util'
-import { Loader, AdapterContext, makeLoader, SocketAdapter } from '@welshman/net'
+import { Router } from '@welshman/router'
-import { Router, addMinimalFallbacks } from '@welshman/router'
-import { call } from '@welshman/lib'
 import { displayDuration, createElement } from './util.js'
 import type { Subscription } from './alert.js'
 import { sendDigest } from './mailer.js'
 import {
   profilesByPubkey,
-  loadRelaySelections,
   loadProfile,
 } from './repository.js'
 

src/env.ts

@@ -1,7 +1,6 @@
 import 'dotenv/config'
 import { always } from '@welshman/lib'
 import { normalizeRelayUrl } from '@welshman/util'
-import { netContext } from '@welshman/net'
 import { Nip01Signer } from '@welshman/signer'
 import { routerContext } from '@welshman/router'
 

src/worker/email.ts

@@ -65,7 +65,7 @@ export const removeJob = (sub: Subscription) => {
 }
 
 // Daily purge of events older than 7 days
-const purgeJob = CronJob.from({
+CronJob.from({
   cronTime: '0 0 3 * * *', // 3am UTC daily
   onTick: async () => {
     const weekAgo = Math.floor(Date.now() / 1000) - 7 * 24 * 3600