fix: harden against three production Sentry crashes (#328)

Three production crashes from the snapotter/node Sentry project.

feature-status (NODE-12): a valid-JSON-but-wrong-shape installed.json
crashed boot via Object.keys(data.bundles). readInstalled() now
normalizes any unusable shape to { bundles: {} }, and the boot recovery
call is wrapped so cleanup can never fatal startup.

image-viewer (NODE-15/17/18): drag-to-pan read .x off an undefined
use-gesture memo on pointerUp or a pinch-into-pan. A guarded pure helper
(resolvePanStart) now falls back to the live pan offset.

Fastify (NODE-14): raised pluginTimeout to 60s so slow self-hosted boots
do not fatal at @fastify/static.

apps/web/src/components/common/image-viewer-drag.ts

@@ -0,0 +1,23 @@
+// Pure, framework-free helpers for ImageViewer drag-to-pan. No React, no DOM,
+// no @use-gesture, so the offset math stays unit-testable in isolation.
+
+export interface Point {
+  x: number;
+  y: number;
+}
+
+/**
+ * Resolve the pan offset a drag started from. @use-gesture only populates
+ * `memo` on the first drag frame, but the handler can still fire on a later
+ * frame without that first frame having run with panning active: on pointerUp,
+ * or when a concurrent pinch flips the viewer into actual-size (pan) mode
+ * mid-gesture. Reading `memo.x` directly then threw in production
+ * (Sentry NODE-15 / NODE-17 / NODE-18: "Cannot read properties of undefined
+ * (reading 'x')", across Chrome/Safari/Firefox). Fall back to the current pan
+ * offset whenever memo is missing; the caller persists the return value as the
+ * next frame's memo.
+ */
+export function resolvePanStart(first: boolean, memo: Point | undefined, panOffset: Point): Point {
+  if (first || !memo) return { ...panOffset };
+  return memo;
+}

apps/web/src/components/common/image-viewer.tsx

@@ -1,6 +1,7 @@
 import { useGesture } from "@use-gesture/react";
 import { FileImage, Maximize, Minimize2, ZoomIn, ZoomOut } from "lucide-react";
 import { useCallback, useEffect, useRef, useState } from "react";
+import { type Point, resolvePanStart } from "@/components/common/image-viewer-drag";
 import { useTranslation } from "@/contexts/i18n-context";
 import { formatFileSize } from "@/lib/download";
 import { cn } from "@/lib/utils";
@@ -148,12 +149,9 @@ export function ImageViewer({
       },
       onDrag: ({ movement: [mx, my], first, memo }) => {
         if (fitModeRef.current !== "actual") return;
-        if (first) {
-          memo = { ...panOffset };
-        }
-        const start = memo as { x: number; y: number };
+        const start = resolvePanStart(first, memo as Point | undefined, panOffset);
         setPanOffset({ x: start.x + mx, y: start.y + my });
-        return memo;
+        return start;
       },
     },
     {