fix: harden and de-slop the merged sidebar/chat/settings batch

Post-merge follow-ups for #2740 #2735 #2734 #2690 #2676 #2738 #2684
#2689 #2733 #2739 #2462 #2687 #2736 #2618 #2697, plus three regressions
found while reviewing them:

- ctrl/cmd+digit while typing no longer switches session tabs (#2503 was
  still open in practice: the guard only covered the mod+alt surface binding)
- Shiki template-call sanitizer now covers every bundled grammar, including
  the js/ts aliases and embedding grammars; timed-out highlight requests are
  memoized and no longer cancel unrelated in-flight requests
- settings flush on suspend uses keepalive and also fires on Capacitor
  appStateChange; keeps the selected model persisted across mode switches
- remote-only branches fetch before checkout; range helpers fail clearly
- git status invalidation now fires for runtime adapters too
- settings number inputs and select triggers size in ch so they scale with
  the interface font
- recent-activity timestamps tick from one list-level ticker
- Markdown preview find goes through the shared find_in_file keybind with
  containment, no longer counts its own bar, and debounces observer runs
- #2676 reverted; #2524 fixed by fading the sticky header's own background
  instead of overlaying the content below it
- sticky group headers in the model picker and sidebar render again
  (oc-sticky-fade-scroller class restored after 9b9d7069c)
- project switcher names are left-aligned again (wrapper lost in 26dbc2f30)
- tool card quick-open icon is always visible and opens the same line as the
  expanded card's button
- tautological tests replaced or removed; new oxlint findings fixed

packages/ui/src/components/session/sidebar/sessions/SessionNodeItem.tsx

@@ -117,6 +117,12 @@ export type SessionNodeItemProps = {
    * if no menu is open. Only one row can have its menu open at a time.
    */
   menuOpenSessionId: string | null;
+  /**
+   * Bumped once a minute by the Recent list so the compact relative
+   * timestamp rendered below recomputes instead of freezing at the value it
+   * had when the row first mounted.
+   */
+  relativeTimeTick?: number;
   /**
    * Precomputed structural key for this node. Encodes the IDs and child
    * counts of all descendants so a reference-only change to `node` (e.g.
@@ -1381,7 +1387,7 @@ function SessionNodeItemComponent(props: SessionNodeItemProps): React.ReactNode
                       {alwaysShowActions ? (
                         // Touch runtimes have no hover tooltip, so the compact
                         // date stays inline there.
-                        <span className="ml-2 inline-flex flex-shrink-0 items-center gap-1 text-[0.72rem] text-muted-foreground/75">
+                        <span className="ml-2 inline-flex flex-shrink-0 items-center gap-1 typography-micro text-muted-foreground/75">
                           {showActivityDuration ? (
                             <SessionActivityDuration sessionId={session.id} running={isStreaming} />
                           ) : (
@@ -1410,7 +1416,7 @@ function SessionNodeItemComponent(props: SessionNodeItemProps): React.ReactNode
                               <SessionActivityDuration
                                 sessionId={session.id}
                                 running={isStreaming}
-                                className="text-[0.72rem]"
+                                className="typography-micro"
                               />
                             ) : (
                               <>
@@ -1430,7 +1436,7 @@ function SessionNodeItemComponent(props: SessionNodeItemProps): React.ReactNode
                                     them, so the revealed row actions never
                                     overlap it. */}
                                 {renderContext === 'recent' ? (
-                                  <span className="flex-shrink-0 text-[0.72rem] leading-none text-muted-foreground/75 tabular-nums">
+                                  <span className="flex-shrink-0 typography-micro leading-none text-muted-foreground/75 tabular-nums">
                                     {sessionCompactUpdatedLabel}
                                   </span>
                                 ) : null}
@@ -1716,6 +1722,7 @@ const areSessionNodeItemPropsEqual = (prev: SessionNodeItemProps, next: SessionN
   if (prev.normalizedSessionSearchQuery !== next.normalizedSessionSearchQuery) return false;
   if (prev.notifyOnSubtasks !== next.notifyOnSubtasks) return false;
   if (prev.nodeStructureKey !== next.nodeStructureKey) return false;
+  if (prev.relativeTimeTick !== next.relativeTimeTick) return false;
   if (getNodeSessionDirectory(prev.node) !== getNodeSessionDirectory(next.node)) return false;
   if (!isSecondaryMetaEqual(prev.secondaryMeta, next.secondaryMeta)) return false;