fix: read a row-addressed repaint as lines in the preview

Measured against a live Claude pane: an Ink TUI paints by ROW and emits
almost no newlines, so dropping cursor-position sequences collapsed a whole
screen into one unreadable line, and a tail cut mid-sequence printed the
remains of it (";1H") as text. Now a jump to column 1 starts a display line,
a jump inside a row moves the write position (capped, since a stream may
address a column no terminal has), and a severed CSI head is dropped before
parsing.

The preview is readable against a real session as a result: tool calls, the
working line and the composer all land where they belong.

Also drop the repeated session name from a search row, whose snippet opens
with the name the row already shows in its first column.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/tui/tui-model.ts

@@ -217,6 +217,16 @@ const SEARCH_GROUP_LABELS: Record<SearchSourceType, string> = {
  * has a session id too, but selecting it would move the cursor to a row that is
  * not on the list.
  */
+/**
+ * A session snippet opens with the session's own name (`w1-alpha — /tmp/alpha`),
+ * which the row already shows in its first column. Dropping the repeat is what
+ * keeps a result row from reading as a stutter.
+ */
+function withoutLabelPrefix(snippet: string, label: string): string {
+  const rest = snippet.startsWith(label) ? snippet.slice(label.length) : snippet;
+  return rest === snippet ? snippet : rest.replace(/^\s*(?:[—:-]\s*)?/, '');
+}
+
 export function buildSearchEntries(
   groups: readonly SearchResultGroup[],
   isLive: (sessionId: string) => boolean
@@ -227,10 +237,11 @@ export function buildSearchEntries(
     entries.push({ kind: 'header', text: SEARCH_GROUP_LABELS[group.type] ?? group.type.toUpperCase() });
     for (const result of group.results) {
       const live = result.jumpTo.kind === 'session' && isLive(result.sessionId);
+      const label = result.jumpTo.relativePath ?? result.sessionName ?? result.sessionId.slice(0, 8);
       entries.push({
         kind: 'result',
-        text: result.jumpTo.relativePath ?? result.sessionName ?? result.sessionId.slice(0, 8),
-        detail: result.snippet,
+        text: label,
+        detail: withoutLabelPrefix(result.snippet, label),
         sessionId: result.sessionId,
         live,
       });