style: remove every em-dash and en-dash

Eighteen occurrences across fourteen files. Each sentence was repunctuated to
suit what the dash was doing rather than swapped for a hyphen, which produces
comma splices. The minus sign in folio-web's ledger is a minus sign and stays.

Claude-Session: https://claude.ai/code/session_01A5KmftdEJ49A9z5mF5ESrX

replay-ui/src/__tests__/action-format.test.ts

@@ -7,7 +7,7 @@ import {
 } from "../lib/action-format";
 import { summary } from "./fixtures";
 
-// Bug class: selector parsing mislabels every action row — splitting on the
+// Bug class: selector parsing mislabels every action row. Splitting on the
 // wrong colon, treating a value-with-colon as the kind, or dropping the prefix
 // ellipsis would render the wrong target tag for every step.
 describe("parseSelector", () => {