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", () => {

replay-ui/src/hooks/useTheme.ts

@@ -28,7 +28,7 @@ export function useTheme(): { theme: ThemeMode; toggle: () => void } {
     try {
       window.localStorage.setItem(STORAGE_KEY, theme);
     } catch {
-      // private mode or storage disabled — theme still applies for the session.
+      // private mode or storage disabled. Theme still applies for the session.
     }
   }, [theme]);
 

replay-ui/src/lib/run-history.ts

@@ -18,8 +18,8 @@ export interface RunHistory {
 // that armed it, so the checker records the violation on the DETECTION step
 // while its witness names the CAUSE step. The timeline dot (the backend's
 // markViolations) already sits on the cause step; mirror that here so the
-// Violations tab and property lanes light up on the same step — the guilty
-// action — not the unrelated action that happened to be running when the
+// Violations tab and property lanes light up on the same step: the guilty
+// action, not the unrelated action that happened to be running when the
 // obligation resolved. Steps are cloned, never mutated in place.
 export function relocateViolationsToCause(
   steps: (Step | null)[],