diff --git a/apps/api/src/jobs/cancel.ts b/apps/api/src/jobs/cancel.ts
index 05b8c60c..e96a65ba 100644
--- a/apps/api/src/jobs/cancel.ts
+++ b/apps/api/src/jobs/cancel.ts
@@ -16,7 +16,7 @@ import type Redis from "ioredis";
 import { db, schema } from "../db/index.js";
 import { createRedisConnection, sharedRedis } from "./connection.js";
 import { getQueue } from "./queues.js";
-import { bullPrefix, POOLS, type Pool } from "./types.js";
+import { bullPrefix, POOLS } from "./types.js";
 
 // ── Per-worker cancel registry ──────────────────────────────────
 
diff --git a/apps/api/src/jobs/connection.ts b/apps/api/src/jobs/connection.ts
index fd38e38e..12597874 100644
--- a/apps/api/src/jobs/connection.ts
+++ b/apps/api/src/jobs/connection.ts
@@ -4,6 +4,7 @@
  * Uses ioredis with settings compatible with BullMQ's requirements
  * (maxRetriesPerRequest: null for blocking commands).
  */
+import type { ConnectionOptions } from "bullmq";
 import Redis from "ioredis";
 import { env } from "../config.js";
 
@@ -19,6 +20,11 @@ export function createRedisConnection(): Redis {
   });
 }
 
+// ioredis 5.11 vs BullMQ's bundled 5.10 type mismatch
+export function createBullMQConnection(): ConnectionOptions {
+  return createRedisConnection() as unknown as ConnectionOptions;
+}
+
 let _shared: Redis | null = null;
 
 /**
diff --git a/apps/api/src/jobs/enqueue.ts b/apps/api/src/jobs/enqueue.ts
index 7d3261fe..3e962a10 100644
--- a/apps/api/src/jobs/enqueue.ts
+++ b/apps/api/src/jobs/enqueue.ts
@@ -10,9 +10,9 @@ import { FlowProducer, type Job, QueueEvents } from "bullmq";
 import { eq } from "drizzle-orm";
 import { env } from "../config.js";
 import { db, schema } from "../db/index.js";
-import { createRedisConnection } from "./connection.js";
+import { createBullMQConnection } from "./connection.js";
 import { getQueue } from "./queues.js";
-import { POOLS, type Pool, queueName, type ToolJobData, type ToolJobResult } from "./types.js";
+import { type Pool, queueName, type ToolJobData, type ToolJobResult } from "./types.js";
 
 // ── QueueEvents (one per pool, lazy) ────────────────────────────
 
@@ -22,7 +22,7 @@ function getQueueEvents(pool: Pool): QueueEvents {
   let qe = queueEventsMap.get(pool);
   if (!qe) {
     qe = new QueueEvents(queueName(pool), {
-      connection: createRedisConnection(),
+      connection: createBullMQConnection(),
     });
     queueEventsMap.set(pool, qe);
   }
@@ -42,7 +42,7 @@ let _flowProducer: FlowProducer | null = null;
 export function getFlowProducer(): FlowProducer {
   if (!_flowProducer) {
     _flowProducer = new FlowProducer({
-      connection: createRedisConnection(),
+      connection: createBullMQConnection(),
     });
   }
   return _flowProducer;
diff --git a/apps/api/src/jobs/queues.ts b/apps/api/src/jobs/queues.ts
index 4a0d8f10..ca8a73bd 100644
--- a/apps/api/src/jobs/queues.ts
+++ b/apps/api/src/jobs/queues.ts
@@ -5,7 +5,7 @@
  * default job options (retry policy, TTL-based cleanup).
  */
 import { Queue } from "bullmq";
-import { createRedisConnection } from "./connection.js";
+import { createBullMQConnection } from "./connection.js";
 import { POOLS, type Pool, queueName, type ToolJobData, type ToolJobResult } from "./types.js";
 
 const queues = new Map<Pool, Queue<ToolJobData, ToolJobResult>>();
@@ -15,7 +15,7 @@ export function getQueue(pool: Pool): Queue<ToolJobData, ToolJobResult> {
   let q = queues.get(pool);
   if (!q) {
     q = new Queue<ToolJobData, ToolJobResult>(queueName(pool), {
-      connection: createRedisConnection(),
+      connection: createBullMQConnection(),
       defaultJobOptions: {
         attempts: pool === "ai" ? 1 : 2,
         backoff: { type: "exponential", delay: 1000 },
diff --git a/apps/api/src/jobs/siem-forward.ts b/apps/api/src/jobs/siem-forward.ts
index 44940e1a..841c1769 100644
--- a/apps/api/src/jobs/siem-forward.ts
+++ b/apps/api/src/jobs/siem-forward.ts
@@ -35,10 +35,10 @@ async function readSettingValue(key: string): Promise<string | null> {
   return row?.value ?? null;
 }
 
-export async function runSiemForward(): Promise<{ forwarded: number } | void> {
+export async function runSiemForward(): Promise<{ forwarded: number } | undefined> {
   // 1. Read SIEM config
   const config = await readSiemConfig();
-  if (!config || !config.enabled || !config.webhookUrl) {
+  if (!config?.enabled || !config.webhookUrl) {
     return;
   }
 
diff --git a/apps/api/src/jobs/worker.ts b/apps/api/src/jobs/worker.ts
index e931fc66..ae0a02d2 100644
--- a/apps/api/src/jobs/worker.ts
+++ b/apps/api/src/jobs/worker.ts
@@ -43,8 +43,8 @@ import {
 import { hasAiJobHandler, runAiToolJob } from "./ai-handlers.js";
 import { recordChildOutcome } from "./batch-progress.js";
 import { registerCancelable, unregisterCancelable } from "./cancel.js";
-import { createRedisConnection } from "./connection.js";
-import { autoSaveToLibrary, buildOutputName, generatePreview } from "./postprocess.js";
+import { createBullMQConnection } from "./connection.js";
+import { buildOutputName, generatePreview } from "./postprocess.js";
 import { runSystemJob } from "./system-jobs.js";
 import { POOLS, type Pool, queueName, type ToolJobData, type ToolJobResult } from "./types.js";
 
@@ -578,7 +578,7 @@ async function processPipelineFinalize(job: Job<ToolJobData>): Promise<ToolJobRe
   // Copy last step's output to outputs/<pipelineJobId>/<filename> so
   // the legacy download URL /api/v1/download/<pipelineJobId>/... works.
   const lastOutputBuffer = await getObjectBuffer(lastOutputRef);
-  const outFilename = lastOutputRef.split("/").pop()!;
+  const outFilename = lastOutputRef.split("/").pop() ?? "output";
   const parentKey = `outputs/${data.jobId}/${outFilename}`;
   await putObject(parentKey, lastOutputBuffer);
 
@@ -636,13 +636,15 @@ async function processPipelineFinalize(job: Job<ToolJobData>): Promise<ToolJobRe
  * failures would skip the DB write and leave the row "processing".
  */
 async function processBatchChild(job: Job<ToolJobData>): Promise<ToolJobResult> {
+  const parentId = job.data.parentId ?? "";
+  const totalFiles = job.data.totalFiles ?? 0;
   try {
     const result = await processToolJob(job);
-    await recordChildOutcome(job.data.parentId!, job.data.totalFiles!, job.data.filename);
+    await recordChildOutcome(parentId, totalFiles, job.data.filename);
     return result;
   } catch (err) {
     const error = stripInternalPaths(err instanceof Error ? err.message : String(err));
-    await recordChildOutcome(job.data.parentId!, job.data.totalFiles!, job.data.filename, error);
+    await recordChildOutcome(parentId, totalFiles, job.data.filename, error);
     // Return a completed job with a failure marker so the parent runs.
     return {
       outputRefs: [],
@@ -687,7 +689,7 @@ async function processBatchFinalize(job: Job<ToolJobData>): Promise<ToolJobResul
     }
 
     if (row.status === "completed" && row.outputRefs?.[0]) {
-      const outFilename = row.outputRefs[0].split("/").pop()!;
+      const outFilename = row.outputRefs[0].split("/").pop() ?? "output";
       manifest.push({ index: i, filename: outFilename, outputRef: row.outputRefs[0] });
     } else {
       const errorMsg = (row.error as { message?: string } | null)?.message ?? "Processing failed";
@@ -732,7 +734,7 @@ export function startWorkers(): void {
       };
 
       const worker = new Worker<ToolJobData, unknown>(queueName(pool), systemProcessor, {
-        connection: createRedisConnection(),
+        connection: createBullMQConnection(),
         concurrency: workerConcurrency,
         stalledInterval: 30_000,
       });
@@ -754,7 +756,7 @@ export function startWorkers(): void {
     };
 
     const worker = new Worker<ToolJobData, ToolJobResult>(queueName(pool), processor, {
-      connection: createRedisConnection(),
+      connection: createBullMQConnection(),
       concurrency: workerConcurrency,
       stalledInterval: 30_000,
     });
diff --git a/apps/api/src/lib/output-format.ts b/apps/api/src/lib/output-format.ts
index 64e55361..99286f37 100644
--- a/apps/api/src/lib/output-format.ts
+++ b/apps/api/src/lib/output-format.ts
@@ -1,25 +1,25 @@
 import sharp from "sharp";
 
+type SharpFormat = keyof sharp.FormatEnum | "avif";
+
 export interface OutputFormat {
-  format: keyof sharp.FormatEnum;
+  format: SharpFormat;
   extension: string;
   contentType: string;
   quality: number;
 }
 
-const FORMAT_MAP: Record<
-  string,
-  { format: keyof sharp.FormatEnum; extension: string; contentType: string }
-> = {
-  jpeg: { format: "jpeg", extension: "jpg", contentType: "image/jpeg" },
-  png: { format: "png", extension: "png", contentType: "image/png" },
-  webp: { format: "webp", extension: "webp", contentType: "image/webp" },
-  gif: { format: "gif", extension: "gif", contentType: "image/gif" },
-  tiff: { format: "tiff", extension: "tiff", contentType: "image/tiff" },
-  avif: { format: "avif", extension: "avif", contentType: "image/avif" },
-  heif: { format: "avif", extension: "avif", contentType: "image/avif" },
-  jxl: { format: "jxl" as keyof sharp.FormatEnum, extension: "jxl", contentType: "image/jxl" },
-};
+const FORMAT_MAP: Record<string, { format: SharpFormat; extension: string; contentType: string }> =
+  {
+    jpeg: { format: "jpeg", extension: "jpg", contentType: "image/jpeg" },
+    png: { format: "png", extension: "png", contentType: "image/png" },
+    webp: { format: "webp", extension: "webp", contentType: "image/webp" },
+    gif: { format: "gif", extension: "gif", contentType: "image/gif" },
+    tiff: { format: "tiff", extension: "tiff", contentType: "image/tiff" },
+    avif: { format: "avif", extension: "avif", contentType: "image/avif" },
+    heif: { format: "avif", extension: "avif", contentType: "image/avif" },
+    jxl: { format: "jxl", extension: "jxl", contentType: "image/jxl" },
+  };
 
 const DEFAULT_QUALITY = 95;
 const PNG_FALLBACK = FORMAT_MAP.png;
diff --git a/apps/api/src/lib/webhook-delivery.ts b/apps/api/src/lib/webhook-delivery.ts
index 8e850825..534819da 100644
--- a/apps/api/src/lib/webhook-delivery.ts
+++ b/apps/api/src/lib/webhook-delivery.ts
@@ -26,7 +26,7 @@ export async function deliverWebhook(
   });
 
   const headers: Record<string, string> = { "Content-Type": "application/json" };
-  if (authHeader) headers["Authorization"] = authHeader;
+  if (authHeader) headers.Authorization = authHeader;
 
   let lastError: string | undefined;
   for (let attempt = 0; attempt <= maxRetries; attempt++) {
diff --git a/apps/api/src/routes/tools/compose.ts b/apps/api/src/routes/tools/compose.ts
index 7e346812..786c910c 100644
--- a/apps/api/src/routes/tools/compose.ts
+++ b/apps/api/src/routes/tools/compose.ts
@@ -142,7 +142,7 @@ export function registerCompose(app: FastifyInstance) {
             input: processedOverlay,
             top: settings.y,
             left: settings.x,
-            blend: settings.blendMode as import("sharp").Blend,
+            blend: settings.blendMode as sharp.Blend,
           },
         ])
         .toBuffer();
diff --git a/apps/api/src/routes/tools/convert.ts b/apps/api/src/routes/tools/convert.ts
index 3a5f2152..a133d852 100644
--- a/apps/api/src/routes/tools/convert.ts
+++ b/apps/api/src/routes/tools/convert.ts
@@ -120,9 +120,7 @@ export function registerConvert(app: FastifyInstance) {
       }
 
       const inputExt = extname(filename).toLowerCase().replace(".", "");
-      const sharpOpts: import("sharp").SharpOptions = isSvgBuffer(inputBuffer)
-        ? { density: 300 }
-        : {};
+      const sharpOpts: sharp.SharpOptions = isSvgBuffer(inputBuffer) ? { density: 300 } : {};
       // Preserve animation frames when both input and output are animatable formats
       if (ANIMATABLE_FORMATS.has(inputExt) && ANIMATABLE_FORMATS.has(settings.format)) {
         sharpOpts.animated = true;
diff --git a/apps/api/src/routes/tools/split.ts b/apps/api/src/routes/tools/split.ts
index 5681b0e2..98eadb1f 100644
--- a/apps/api/src/routes/tools/split.ts
+++ b/apps/api/src/routes/tools/split.ts
@@ -24,14 +24,16 @@ const settingsSchema = z.object({
   quality: z.number().min(1).max(100).default(90),
 });
 
+type SharpFormat = keyof sharp.FormatEnum | "avif";
+
 function resolveOutputFormat(
   outputFormat: string,
   originalExt: string,
-): { sharpFormat: keyof sharp.FormatEnum | null; ext: string } {
+): { sharpFormat: SharpFormat | null; ext: string } {
   if (outputFormat === "original") {
     return { sharpFormat: null, ext: originalExt };
   }
-  const map: Record<string, { sharpFormat: keyof sharp.FormatEnum; ext: string }> = {
+  const map: Record<string, { sharpFormat: SharpFormat; ext: string }> = {
     png: { sharpFormat: "png", ext: ".png" },
     jpg: { sharpFormat: "jpeg", ext: ".jpg" },
     webp: { sharpFormat: "webp", ext: ".webp" },
diff --git a/apps/api/src/routes/tools/strip-metadata.ts b/apps/api/src/routes/tools/strip-metadata.ts
index 89edac43..73ca2846 100644
--- a/apps/api/src/routes/tools/strip-metadata.ts
+++ b/apps/api/src/routes/tools/strip-metadata.ts
@@ -209,7 +209,7 @@ export function registerStripMetadata(app: FastifyInstance) {
         case "webp":
           result.webp({ quality: 85 });
           break;
-        case "avif":
+        case "heif":
           result.avif({ quality: 50 });
           break;
         case "tiff":
diff --git a/apps/web/src/components/layout/app-layout.tsx b/apps/web/src/components/layout/app-layout.tsx
index fee64429..464df068 100644
--- a/apps/web/src/components/layout/app-layout.tsx
+++ b/apps/web/src/components/layout/app-layout.tsx
@@ -37,10 +37,7 @@ export function AppLayout({ children, breadcrumb, navVariant }: AppLayoutProps)
       />
 
       {/* Main content area */}
-      <main
-        id="main-content"
-        className={cn("flex-1 overflow-y-auto", isMobile && "pb-20")}
-      >
+      <main id="main-content" className={cn("flex-1 overflow-y-auto", isMobile && "pb-20")}>
         {children}
       </main>
 
diff --git a/apps/web/src/hooks/use-recent-tools.ts b/apps/web/src/hooks/use-recent-tools.ts
index b4159007..1f684fc7 100644
--- a/apps/web/src/hooks/use-recent-tools.ts
+++ b/apps/web/src/hooks/use-recent-tools.ts
@@ -37,7 +37,7 @@ export function recordRecentTool(toolId: string) {
   const updated = [toolId, ...current.filter((id) => id !== toolId)].slice(0, MAX_RECENT);
   localStorage.setItem(STORAGE_KEY, JSON.stringify(updated));
   cachedRaw = null;
-  listeners.forEach((l) => l());
+  for (const l of listeners) l();
 }
 
 export function useRecentTools(): string[] {
diff --git a/packages/image-engine/src/engine.ts b/packages/image-engine/src/engine.ts
index 99a850dc..976a1699 100644
--- a/packages/image-engine/src/engine.ts
+++ b/packages/image-engine/src/engine.ts
@@ -109,7 +109,7 @@ export async function processImage(
     if (!sharpFormat) {
       throw new Error(`Unsupported output format: ${outputFormat}`);
     }
-    image = image.toFormat(sharpFormat as keyof import("sharp").FormatEnum);
+    image = image.toFormat(sharpFormat as keyof sharp.FormatEnum);
   }
 
   const buffer = await image.toBuffer();
diff --git a/packages/image-engine/src/operations/compress.ts b/packages/image-engine/src/operations/compress.ts
index f84f65b4..e31d9a1d 100644
--- a/packages/image-engine/src/operations/compress.ts
+++ b/packages/image-engine/src/operations/compress.ts
@@ -31,7 +31,7 @@ export async function compress(image: Sharp, options: CompressOptions): Promise<
   const safeDetected = NO_ENCODER.has(detected) ? "png" : detected;
   const outputFormat = (FORMAT_MAP[format ?? ""] ??
     FORMAT_MAP[safeDetected] ??
-    safeDetected) as keyof import("sharp").FormatEnum;
+    safeDetected) as keyof sharp.FormatEnum;
 
   if (targetSizeBytes !== undefined) {
     if (targetSizeBytes <= 0) {
@@ -52,7 +52,7 @@ export async function compress(image: Sharp, options: CompressOptions): Promise<
 async function findBestQuality(
   inputBuffer: Buffer,
   resize: { width: number; height: number } | null,
-  format: keyof import("sharp").FormatEnum,
+  format: keyof sharp.FormatEnum,
   targetBytes: number,
 ): Promise<number | null> {
   let low = 1;
@@ -82,7 +82,7 @@ async function findBestQuality(
 
 async function compressToTargetSize(
   inputBuffer: Buffer,
-  format: keyof import("sharp").FormatEnum,
+  format: keyof sharp.FormatEnum,
   targetBytes: number,
 ): Promise<Sharp> {
   const quality = await findBestQuality(inputBuffer, null, format, targetBytes);
diff --git a/packages/image-engine/src/operations/convert.ts b/packages/image-engine/src/operations/convert.ts
index c566178e..1460ed7d 100644
--- a/packages/image-engine/src/operations/convert.ts
+++ b/packages/image-engine/src/operations/convert.ts
@@ -1,3 +1,4 @@
+import type sharp from "sharp";
 import type { ConvertOptions, Sharp } from "../types.js";
 
 /**
@@ -31,5 +32,5 @@ export async function convert(image: Sharp, options: ConvertOptions): Promise<Sh
     formatOptions.quality = quality;
   }
 
-  return image.toFormat(sharpFormat as keyof import("sharp").FormatEnum, formatOptions);
+  return image.toFormat(sharpFormat as keyof sharp.FormatEnum, formatOptions);
 }
diff --git a/packages/shared/src/constants.ts b/packages/shared/src/constants.ts
index bfd91b0d..d68c745f 100644
--- a/packages/shared/src/constants.ts
+++ b/packages/shared/src/constants.ts
@@ -1,4 +1,10 @@
-import { AUDIO_INPUTS, IMAGE_INPUTS, MODALITY_URL_SLUG, SUBTITLE_INPUTS, VIDEO_INPUTS } from "./modality.js";
+import {
+  AUDIO_INPUTS,
+  IMAGE_INPUTS,
+  MODALITY_URL_SLUG,
+  SUBTITLE_INPUTS,
+  VIDEO_INPUTS,
+} from "./modality.js";
 import type { CategoryInfo, SocialMediaPreset, Tool } from "./types.js";
 
 export const CATEGORIES: CategoryInfo[] = [