fix(teleprompter): address review findings and the e2e ordering failure

The e2e run failed because 214-rundown-switch-edit loads a fresh rundown,
leaving the teleprompter spec with nothing to read. The spec now seeds its
own script entry, idempotently, so it no longer depends on which rundown a
previous spec happened to leave loaded.

Review findings:

- PresetView rendered outside ViewLoader, so a view reached through a preset
  never got the project's CSS override stylesheet.
- The help overlay was a bare div. It is now a Dialog, so focus moves into it
  and back out, Escape closes it instead of rewinding the script, and the
  prompter keymap stands down while it is open.
- Space is left unbound rather than made a no-op when a view claims it.
  useHotkeys calls preventDefault before reaching the handler, so an early
  return still swallowed the key and stopped Space activating a focused button.
- The scroll observer attached on mount only, so a scroller which mounted later
  (the empty state resolving into a script) was never measured and could not
  play. Callback refs attach it whenever the elements appear.
- jumpToEnd marked the end state before the document had been measured.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Cb8RVPNQ2ETPJxdy4b8CHf

apps/client/src/AppRouter.tsx

@@ -225,12 +225,19 @@ function PresetView() {
   const Component = PresetViewMap[preset.target as OntimeViewPresettable];
   return (
     <PresetContext value={preset}>
-      <ViewNavigationMenu
-        isNavigationLocked={getIsNavigationLocked()}
-        suppressSettings
-        suppressSpaceHotkey={preset.target === OntimeView.Teleprompter}
-      />
-      {Component ? <Component /> : <NotFound />}
+      {/*
+        Presets render the same views as the direct routes and need the same
+        wrapper: ViewLoader is what injects the project's CSS override
+        stylesheet. Without it a preset silently ignores configured styling.
+      */}
+      <ViewLoader>
+        <ViewNavigationMenu
+          isNavigationLocked={getIsNavigationLocked()}
+          suppressSettings
+          suppressSpaceHotkey={preset.target === OntimeView.Teleprompter}
+        />
+        {Component ? <Component /> : <NotFound />}
+      </ViewLoader>
     </PresetContext>
   );
 }

apps/client/src/common/components/navigation-menu/ViewNavigationMenu.tsx

@@ -1,4 +1,4 @@
-import { useDisclosure, useHotkeys } from '@mantine/hooks';
+import { type HotkeyItem, useDisclosure, useHotkeys } from '@mantine/hooks';
 import { memo } from 'react';
 import { useSearchParams } from 'react-router';
 
@@ -24,15 +24,27 @@ function ViewNavigationMenu({ isNavigationLocked, suppressSettings, suppressSpac
   const [searchParams] = useSearchParams();
   const hasSavedChanges = hasCustomParams(searchParams);
 
+  /**
+   * The Space binding is left out entirely rather than made a no-op, because
+   * useHotkeys calls preventDefault before it reaches the handler. A handler
+   * which returns early still swallows the key, which would stop Space
+   * activating whichever button the user has focused.
+   */
+  const spaceHotkey: HotkeyItem[] = suppressSpaceHotkey
+    ? []
+    : [
+        [
+          'Space',
+          () => {
+            if (isNavigationLocked) return;
+            menuHandler.toggle();
+          },
+          { preventDefault: true },
+        ],
+      ];
+
   useHotkeys([
-    [
-      'Space',
-      () => {
-        if (isNavigationLocked || suppressSpaceHotkey) return;
-        menuHandler.toggle();
-      },
-      { preventDefault: true },
-    ],
+    ...spaceHotkey,
     [
       'mod + ,',
       () => {

apps/client/src/views/teleprompter/Teleprompter.scss

@@ -205,19 +205,30 @@
   color: $viewer-label-color;
 }
 
+/**
+ * The help dialog is portalled to the body, so unlike the other overlays it sits
+ * outside the view root: fixed positioning is correct here, and it is not caught
+ * by the flip, which keeps it readable on a mirrored rig. Being outside also
+ * means it inherits nothing from the view and states its own colours.
+ */
 .teleprompter__help {
-  position: absolute;
+  position: fixed;
   inset: 0;
-  display: grid;
-  place-items: center;
   background: rgba(0, 0, 0, 0.75);
 }
 
 .teleprompter__help-card {
-  max-height: 80%;
+  position: fixed;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+
+  max-height: 80dvh;
   overflow-y: auto;
   padding: clamp(16px, 2vw, 24px);
-  background: $viewer-card-bg-color;
+
+  background: $viewer-background-color;
+  color: $viewer-color;
   border-radius: $element-border-radius;
   font-size: $base-font-size;
 }

apps/client/src/views/teleprompter/Teleprompter.tsx

@@ -101,6 +101,7 @@ function Teleprompter({ rundown, rundownMetadata, customFields }: TeleprompterDa
 
   useTeleprompterControls({
     controller,
+    isHelpOpen: showHelp,
     onFlip: handleFlip,
     onFontSize: handleFontSize,
     onResetFontSize: handleResetFontSize,
@@ -168,7 +169,7 @@ function Teleprompter({ rundown, rundownMetadata, customFields }: TeleprompterDa
         </>
       )}
 
-      {showHelp && <HelpOverlay onClose={handleToggleHelp} />}
+      <HelpOverlay isOpen={showHelp} onClose={handleToggleHelp} />
     </div>
   );
 }

apps/client/src/views/teleprompter/help-overlay/HelpOverlay.tsx

@@ -1,6 +1,9 @@
+import { Dialog } from '@base-ui/react/dialog';
+
 import Button from '../../../common/components/buttons/Button';
 
 interface HelpOverlayProps {
+  isOpen: boolean;
   onClose: () => void;
 }
 
@@ -22,27 +25,42 @@ const shortcuts: { keys: string; action: string }[] = [
 /**
  * Most prompter foot pedals and hand controllers are USB HID devices which send
  * these same keystrokes, so this list doubles as the hardware reference.
+ *
+ * Built on the shared Dialog rather than a bare overlay so it behaves as a
+ * modal: focus moves into it, stays inside it, and returns to where it came
+ * from. Escape closes the dialog instead of rewinding the script, and the
+ * prompter keymap stands down for as long as it is open.
  */
-export default function HelpOverlay({ onClose }: HelpOverlayProps) {
+export default function HelpOverlay({ isOpen, onClose }: HelpOverlayProps) {
   return (
-    <div className='teleprompter__help' role='dialog' aria-label='Keyboard shortcuts'>
-      <div className='teleprompter__help-card'>
-        <div className='teleprompter__help-title'>Controls</div>
-        <dl className='teleprompter__help-list'>
-          {shortcuts.map(({ keys, action }) => (
-            <div key={keys} className='teleprompter__help-row'>
-              <dt className='teleprompter__help-keys'>{keys}</dt>
-              <dd className='teleprompter__help-action'>{action}</dd>
-            </div>
-          ))}
-        </dl>
-        <div className='teleprompter__help-note'>
-          Foot pedals and hand controllers which emit these keys work without any setup.
-        </div>
-        <Button variant='subtle-white' onClick={onClose} className='teleprompter__help-close'>
-          Close
-        </Button>
-      </div>
-    </div>
+    <Dialog.Root
+      open={isOpen}
+      onOpenChange={(open) => {
+        if (!open) {
+          onClose();
+        }
+      }}
+    >
+      <Dialog.Portal>
+        <Dialog.Backdrop className='teleprompter__help' />
+        <Dialog.Popup className='teleprompter__help-card'>
+          <Dialog.Title className='teleprompter__help-title'>Controls</Dialog.Title>
+          <dl className='teleprompter__help-list'>
+            {shortcuts.map(({ keys, action }) => (
+              <div key={keys} className='teleprompter__help-row'>
+                <dt className='teleprompter__help-keys'>{keys}</dt>
+                <dd className='teleprompter__help-action'>{action}</dd>
+              </div>
+            ))}
+          </dl>
+          <div className='teleprompter__help-note'>
+            Foot pedals and hand controllers which emit these keys work without any setup.
+          </div>
+          <Button variant='subtle-white' onClick={onClose} className='teleprompter__help-close'>
+            Close
+          </Button>
+        </Dialog.Popup>
+      </Dialog.Portal>
+    </Dialog.Root>
   );
 }

apps/client/src/views/teleprompter/useTeleprompterControls.ts

@@ -6,6 +6,8 @@ import type { TeleprompterAction, TeleprompterController } from './teleprompter.
 
 interface UseTeleprompterControlsArgs {
   controller: TeleprompterController;
+  /** the help dialog is modal, so the keymap stands down while it is open */
+  isHelpOpen: boolean;
   onFlip: (axis: 'h' | 'v') => void;
   onFontSize: (delta: number) => void;
   onResetFontSize: () => void;
@@ -67,8 +69,18 @@ export function useTeleprompterControls(args: UseTeleprompterControlsArgs) {
       if (target && (ignoredTags.has(target.tagName) || target.isContentEditable)) {
         return;
       }
-      // the params editor is a form, it owns the keyboard while it is open
-      if (useViewParamsEditorStore.getState().isOpen) {
+      // the params editor and the help dialog are modal, they own the keyboard
+      if (useViewParamsEditorStore.getState().isOpen || argsRef.current.isHelpOpen) {
+        return;
+      }
+
+      /**
+       * A focused button is activated by Space and Enter. Resolving those into
+       * prompter actions here, and calling preventDefault, would stop the button
+       * doing its own job: tabbing to the help control and pressing Space would
+       * start the script rather than open the help.
+       */
+      if ((event.code === 'Space' || event.key === 'Enter') && target?.closest('button, a, [role="button"]')) {
         return;
       }
 

apps/client/src/views/teleprompter/useTeleprompterScroll.ts

@@ -60,6 +60,23 @@ export function useTeleprompterScroll({
   const contentRef = useRef<HTMLDivElement | null>(null);
   const blockRefs = useRef(new Map<string, HTMLElement>());
 
+  /**
+   * The view renders an empty state instead of the scroller until a script is
+   * chosen, so these elements can arrive long after mount. Tracking that in
+   * state is what lets the measuring effect run when they do: keyed only on the
+   * refs it would have run once, against nothing, and playback would sit dead
+   * until the page was reloaded.
+   */
+  const [isScrollerMounted, setIsScrollerMounted] = useState(false);
+  const attachScroller = useCallback((element: HTMLDivElement | null) => {
+    scrollerRef.current = element;
+    setIsScrollerMounted(Boolean(element && contentRef.current));
+  }, []);
+  const attachContent = useCallback((element: HTMLDivElement | null) => {
+    contentRef.current = element;
+    setIsScrollerMounted(Boolean(element && scrollerRef.current));
+  }, []);
+
   // authoritative, sub-pixel scroll position
   const posRef = useRef(0);
   const lastTsRef = useRef(0);
@@ -206,7 +223,7 @@ export function useTeleprompterScroll({
     observer.observe(scroller);
     observer.observe(content);
     return () => observer.disconnect();
-  }, [measure]);
+  }, [measure, isScrollerMounted]);
 
   // webfonts land after first paint and reflow the whole document
   useEffect(() => {
@@ -319,14 +336,20 @@ export function useTeleprompterScroll({
       },
       jumpToEnd: () => {
         catchUpTargetRef.current = Math.max(maxScrollRef.current, 0);
+        // the eased branch never reports the end, only the playing one does
+        if (maxScrollRef.current > 0) {
+          runningRef.current = false;
+          setIsRunning(false);
+          setAtEnd(true);
+        }
       },
       reengageFollow: () => setFollowLocked(false),
     };
   }, []);
 
   return {
-    scrollerRef,
-    contentRef,
+    scrollerRef: attachScroller,
+    contentRef: attachContent,
     registerBlock,
     handleUserScroll,
     controller,