revert: drop Umami concurrency change

Board scaling: no sideways scrolling
- Revert the pannable narrow canvas. The canvas fits the viewport again and
  `.viewport` goes back to `overflow: clip`, so a board can never widen the
  document or scroll horizontally.
- Fix the unreadable-narrow-board regression at the real cause instead: cap the
  inverse UI compensation at 2x (50% canvas scale). Down to 50% text and
  controls keep their physical size; below it the board zooms out as a whole, so
  a 200x200 logical tile hosts at most 28px logical text rather than 96px and
  content stops overlapping its neighbours.

Touch editing
- Add `touch-action: none` to `.board-grid-entry`, the dnd-kit draggable and its
  own drag handle. The 200ms touch activation delay is useless if the browser
  has already handed the gesture to page panning and emitted `pointercancel`.
  Only edit mode renders this element.

Custom widgets
- Memoize the merged `data`/`status`/`options` passed to `CustomJsxRenderer`.
  They were rebuilt every render, so the compiled-template memo never hit and
  the new reference-identity boundary key changed on every render, resetting the
  error boundary and forcing an extra reconciliation of the widget subtree.
- Keep the cache key when the shared Redis cache is unavailable so the
  process-local cache still absorbs polling instead of sending every widget
  refresh upstream.
- Reclaim the shared cache's LRU/size/byte bookkeeping for TTL-expired entries
  and touch the LRU in the same script, so expired ghosts stop consuming the
  64 MiB budget and a read costs one round trip instead of two.

Forwarded IP
- Restore `ipAddressFromHeaders` to the full forwarding chain and add
  `trustedIpAddressFromHeaders` for the last hop. Repointing the shared helper
  had collapsed MCP failed-auth rate limiting into a single bucket for every
  client behind a reverse proxy and replaced the client IP with the proxy IP in
  API-key auth logs.

Runtime and restore
- Make the new /appdata ownership migration best-effort. Under `set -e` a mount
  that rejects chown (CIFS/SMB, fixed-uid NFS) turned into a container that
  refuses to start, and /appdata was never chowned before.
- Report malformed metadata.json as such instead of blaming the archive.

apps/nextjs/src/app/[locale]/boards/[name]/settings/_layout.tsx

@@ -93,8 +93,7 @@ export const LayoutSettingsContent = ({ board, form, isSaving, saveSettingsAsync
         setResettingLayoutId(layout.id);
         void (async () => {
           try {
-            const savedValues = form.isDirty() ? await saveSettingsAsync() : form.values;
-            const canonicalLayout = savedValues ? findCanonicalLayout(savedValues.layouts, layout) : undefined;
+            const canonicalLayout = board.layouts.find((candidate) => candidate.id === layout.id);
             if (!canonicalLayout) return;
 
             await resetLayout({ boardId: board.id, layoutId: canonicalLayout.id });

packages/widgets/src/media-missing/component.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import type { ReactNode } from "react";
-import { useEffect, useState } from "react";
+import { useEffect, useRef, useState } from "react";
 import {
   Badge,
   Box,
@@ -58,6 +58,10 @@ export default function MediaMissingWidget({
   });
   const data = getUsableWidgetQueryData(mediaQuery);
   const [selectedTab, setSelectedTab] = useState<MediaMissingTab>(showMissing ? "missing" : "queued");
+  const tabScrollPositionsRef = useRef<Record<MediaMissingTab, { x: number; y: number }>>({
+    missing: { x: 0, y: 0 },
+    queued: { x: 0, y: 0 },
+  });
   const activeTab = resolveMediaMissingTab(selectedTab, showMissing, showQueued);
 
   useEffect(() => {
@@ -92,10 +96,18 @@ export default function MediaMissingWidget({
   const tabLabel = (label: string, shown: number, total: number) => (isThin ? total : `${label} (${shown}/${total})`);
 
   const renderPanel = (
+    tab: MediaMissingTab,
     entries: { item: MissingMediaItem | QueuedMediaItem; integrationId: string }[],
     emptyLabel: string,
   ) => (
-    <ScrollArea h="100%" scrollbarSize={4}>
+    <ScrollArea
+      h="100%"
+      scrollbarSize={4}
+      startScrollPosition={tabScrollPositionsRef.current[tab]}
+      onScrollPositionChange={(position) => {
+        tabScrollPositionsRef.current[tab] = position;
+      }}
+    >
       <Box p="xs">
         {entries.length === 0 ? (
           <Text size="sm" c="dimmed" ta="center" py="md">
@@ -146,7 +158,7 @@ export default function MediaMissingWidget({
                   {tabLabel(t("tab.missing"), missing.length, missingCount)}
                 </Text>
               </Group>
-              <Box h="calc(100% - 40px)">{renderPanel(missing, t("empty.missing"))}</Box>
+              <Box h="calc(100% - 40px)">{renderPanel("missing", missing, t("empty.missing"))}</Box>
             </Paper>
           )}
           {showQueued && (
@@ -157,7 +169,7 @@ export default function MediaMissingWidget({
                   {tabLabel(t("tab.queued"), queued.length, queuedCount)}
                 </Text>
               </Group>
-              <Box h="calc(100% - 40px)">{renderPanel(queued, t("empty.queued"))}</Box>
+              <Box h="calc(100% - 40px)">{renderPanel("queued", queued, t("empty.queued"))}</Box>
             </Paper>
           )}
         </SimpleGrid>
@@ -202,12 +214,12 @@ export default function MediaMissingWidget({
 
       {showMissing && (
         <Tabs.Panel value="missing" flex={1} style={{ overflow: "hidden" }}>
-          {activeTab === "missing" && renderPanel(missing, t("empty.missing"))}
+          {activeTab === "missing" && renderPanel("missing", missing, t("empty.missing"))}
         </Tabs.Panel>
       )}
       {showQueued && (
         <Tabs.Panel value="queued" flex={1} style={{ overflow: "hidden" }}>
-          {activeTab === "queued" && renderPanel(queued, t("empty.queued"))}
+          {activeTab === "queued" && renderPanel("queued", queued, t("empty.queued"))}
         </Tabs.Panel>
       )}
     </Tabs>