chore: sweep em dashes from our own source and README (#13)

src/lib/components/ChatView.tsx

@@ -35,7 +35,7 @@ import { recencyGroup, truncate } from "../utils";
  *
  * - The search bar is the composer. It is the only always-focused text input in
  *   a `List`, which is what makes "hit a hotkey, then just start typing" work.
- * - `filtering` is off, because the left column is a conversation switcher — the
+ * - `filtering` is off, because the left column is a conversation switcher. The
  *   builtin fuzzy filter would hide rows as the user types their question.
  * - `Detail` accepts no typed input (`onSearchTextChange` exists only on `List`,
  *   `Grid`, `Form` and `Dropdown`), so the left column cannot be dropped: it is
@@ -87,7 +87,7 @@ export function ChatView({ initialSession, initialPrompt }: ChatViewProps) {
   /**
    * Reopening the command continues the most recent conversation, but only if it
    * was used recently. Past the configured idle window it starts a fresh chat
-   * instead — the previous conversation is never removed, it just drops down the
+   * instead. The previous conversation is never removed, it just drops down the
    * sidebar. Setting the preference to "Never" keeps the last chat open forever.
    */
   useEffect(() => {
@@ -218,7 +218,7 @@ export function ChatView({ initialSession, initialPrompt }: ChatViewProps) {
 
   /**
    * The primary action adapts to the search bar. With text in it, Return sends;
-   * with it empty — where sending would be a no-op anyway — Return opens the
+   * with it empty (where sending would be a no-op anyway), Return opens the
    * highlighted conversation instead.
    */
   const rowActions = (row: SessionRow) => {
@@ -249,8 +249,8 @@ export function ChatView({ initialSession, initialPrompt }: ChatViewProps) {
   }
 
   const placeholder = chat.status
-    ? `${chat.status} — press ⏎ to stop`
-    : "Lam is thinking — press ⏎ to stop";
+    ? `${chat.status}. Press ⏎ to stop`
+    : "Lam is thinking. Press ⏎ to stop";
 
   return (
     <List