feat(rundown): clarify offset toggle with labels and info tip

The Absolute/Relative offset toggle in the rundown header gave users no
hint it was even about offsets, and its explanation only lived on
per-button hover (low discoverability, splits a comparative concept).

- Add a small group label to each toolbar toggle (Mode / View / Offset)
  so each control's purpose is self-evident at a glance.
- Add an info icon on the Offset group with a single tooltip explaining
  both modes together, reusing the existing Tooltip + IoInformationCircle
  pattern. Removes the now-redundant per-button offset tooltips.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Hj5P4eDgf97zSCzViGHNDy

apps/client/src/features/rundown/rundown-header/RundownHeader.module.scss

@@ -58,8 +58,31 @@
   }
 }
 
-.toggleTooltipTrigger {
+.controlGroup {
   display: flex;
+  align-items: center;
+  gap: 0.375rem;
+}
+
+.groupLabel {
+  color: $gray-400;
+  font-size: calc(1rem - 3px);
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.02em;
+  white-space: nowrap;
+}
+
+.infoIcon {
+  display: flex;
+  align-items: center;
+  color: $gray-400;
+  font-size: calc(1rem + 1px);
+  cursor: help;
+
+  &:hover {
+    color: $gray-200;
+  }
 }
 
 .apart {

apps/client/src/features/rundown/rundown-header/RundownHeader.tsx

@@ -3,6 +3,7 @@ import { ToggleGroup } from '@base-ui/react/toggle-group';
 import { Toolbar } from '@base-ui/react/toolbar';
 import { OffsetMode } from 'ontime-types';
 import { memo } from 'react';
+import { IoInformationCircle } from 'react-icons/io5';
 
 import Tooltip from '../../../common/components/tooltip/Tooltip';
 import { setOffsetMode, useOffsetMode } from '../../../common/hooks/useSocket';
@@ -74,52 +75,61 @@ function RundownHeader({ isExtracted, viewMode, setViewMode }: RundownHeaderProp
   return (
     <Toolbar.Root className={style.header}>
       {showRunEditToggle && (
-        <ToggleGroup value={[editorMode]} onValueChange={toggleAppMode} className={style.group}>
-          <Tooltip
-            text='Live playback view with auto-follow'
-            render={<Toolbar.Button render={<Toggle />} value={AppMode.Run} className={style.radioButton} />}
-          >
-            Run
-          </Tooltip>
-          <Tooltip
-            text='Manual editing without playback automation'
-            render={<Toolbar.Button render={<Toggle />} value={AppMode.Edit} className={style.radioButton} />}
-          >
-            Edit
-          </Tooltip>
-        </ToggleGroup>
+        <div className={style.controlGroup}>
+          <span className={style.groupLabel}>Mode</span>
+          <ToggleGroup value={[editorMode]} onValueChange={toggleAppMode} className={style.group}>
+            <Tooltip
+              text='Live playback view with auto-follow'
+              render={<Toolbar.Button render={<Toggle />} value={AppMode.Run} className={style.radioButton} />}
+            >
+              Run
+            </Tooltip>
+            <Tooltip
+              text='Manual editing without playback automation'
+              render={<Toolbar.Button render={<Toggle />} value={AppMode.Edit} className={style.radioButton} />}
+            >
+              Edit
+            </Tooltip>
+          </ToggleGroup>
+        </div>
       )}
 
-      <ToggleGroup value={[viewMode]} onValueChange={toggleViewMode} className={style.group}>
-        <Tooltip
-          text='View rundown in list mode'
-          render={<Toolbar.Button render={<Toggle />} value={RundownViewMode.List} className={style.radioButton} />}
-        >
-          List
-        </Tooltip>
-        <Tooltip
-          text='View rundown in table mode'
-          render={<Toolbar.Button render={<Toggle />} value={RundownViewMode.Table} className={style.radioButton} />}
-        >
-          Table
-        </Tooltip>
-      </ToggleGroup>
-
-      {showOffsetToggle && (
-        <ToggleGroup value={[offsetMode]} onValueChange={toggleOffsetMode} className={style.group}>
+      <div className={style.controlGroup}>
+        <span className={style.groupLabel}>View</span>
+        <ToggleGroup value={[viewMode]} onValueChange={toggleViewMode} className={style.group}>
           <Tooltip
-            text='Offsets use fixed clock time'
-            render={<Toolbar.Button render={<Toggle />} value={OffsetMode.Absolute} className={style.radioButton} />}
+            text='View rundown in list mode'
+            render={<Toolbar.Button render={<Toggle />} value={RundownViewMode.List} className={style.radioButton} />}
           >
-            Absolute
+            List
           </Tooltip>
           <Tooltip
-            text='Offsets follow the rundown relative start'
-            render={<Toolbar.Button render={<Toggle />} value={OffsetMode.Relative} className={style.radioButton} />}
+            text='View rundown in table mode'
+            render={<Toolbar.Button render={<Toggle />} value={RundownViewMode.Table} className={style.radioButton} />}
           >
-            Relative
+            Table
           </Tooltip>
         </ToggleGroup>
+      </div>
+
+      {showOffsetToggle && (
+        <div className={style.controlGroup}>
+          <span className={style.groupLabel}>Offset</span>
+          <ToggleGroup value={[offsetMode]} onValueChange={toggleOffsetMode} className={style.group}>
+            <Toolbar.Button render={<Toggle />} value={OffsetMode.Absolute} className={style.radioButton}>
+              Absolute
+            </Toolbar.Button>
+            <Toolbar.Button render={<Toggle />} value={OffsetMode.Relative} className={style.radioButton}>
+              Relative
+            </Toolbar.Button>
+          </ToggleGroup>
+          <Tooltip
+            text='Absolute measures offset against the scheduled clock time. Relative measures it from when the rundown actually started.'
+            render={<span className={style.infoIcon} />}
+          >
+            <IoInformationCircle />
+          </Tooltip>
+        </div>
       )}
 
       {showOverflowMenu && <RundownMenu allowNavigation={!isExtracted} />}