fix(tui): recompute virtual tail after width resize

Avoid preserving a frozen virtual transcript range when wrapped rows shrink enough that the old tail window no longer covers the viewport.

ui-tui/src/hooks/useVirtualHistory.ts

@@ -248,8 +248,26 @@ export function useVirtualHistory(
   // During a freeze, drop the frozen range if items shrank past its start
   // (/clear, compaction) — clamping would collapse to an empty mount and
   // flash blank. Fall through to the normal path in that case.
-  const frozenRange =
-    freezeRenders.current > 0 && prevRange.current && prevRange.current[0] < n ? prevRange.current : null
+  const frozenRangeCandidate =
+    freezeRenders.current > 0 && prevRange.current && prevRange.current[0] < n
+      ? ([prevRange.current[0], Math.min(prevRange.current[1], n)] as const)
+      : null
+
+  // Width grows can shrink wrapped rows enough that the old tail window no
+  // longer covers the viewport. In that case freezing preserves stale spacers
+  // and visually cuts off the last message, so recompute immediately.
+  const frozenRange = (() => {
+    if (!frozenRangeCandidate || vp <= 0) {
+      return frozenRangeCandidate
+    }
+
+    const visibleTop = sticky && !recentManual ? Math.max(0, total - vp) : target
+    const visibleBottom = visibleTop + vp
+    const rangeTop = offsets[frozenRangeCandidate[0]] ?? 0
+    const rangeBottom = offsets[frozenRangeCandidate[1]] ?? total
+
+    return rangeTop <= visibleTop && rangeBottom >= visibleBottom ? frozenRangeCandidate : null
+  })()
 
   let start = 0
   let end = n
@@ -464,6 +482,7 @@ export function useVirtualHistory(
 
     if (skipMeasurement.current) {
       skipMeasurement.current = false
+      bumpMeasuredHeightVersion(n => n + 1)
     } else {
       for (let i = effStart; i < effEnd; i++) {
         const k = items[i]?.key