fix(web-presenter): align note with shipped TUI web arm, symbolize ref, guard branch

Rewrite the Agent Note's stale 'TUI has no web arm' claim to match the
web fallback branch this PR added to transcript.ts. Replace the hardcoded
line-number comment with a symbolic reference, and mark the web arm's
unreachable optional-chain undefined side with a reasoned v8 ignore for
the per-file 100% branch gate.

packages/ui/tui/src/components/transcript.ts

@@ -393,10 +393,16 @@ export class ToolCardComponent implements Component {
     // content (the `web` view carries no `content` copy), both render as one dim
     // Markdown block below, so links/lists/headings keep the unified dim styling
     // rather than reading as bare text. Terminal and diff cards own their body
-    // styling, so they are excluded (mirrors renderBody's fallback at line 511).
+    // styling, so they are excluded (mirrors renderBody's post-terminal/diff fallback).
     const markdownContent = view.card === 'generic'
       ? view.content ?? this.result?.content
-      : view.card === 'web' ? this.result?.content : undefined
+      : view.card === 'web'
+        // A web resultView is only assigned alongside this.result (the result
+        // handler sets both) and the pending callView is never a web card, so
+        // the optional-chain undefined side is unreachable here.
+        /* v8 ignore next */
+        ? this.result?.content
+        : undefined
     const unknownXml = this.definition === undefined && markdownContent !== undefined
       ? renderUnknownXml(
         displayText(contentText(markdownContent)),