fix(mod-tools): empty-value placeholder no longer renders as music note

User reported empty fields (Email, Last Purchase, Lock Expires, Banned
Accs, Abusive CFHs) showing what looks like a music-note glyph next to
the label. They aren't censored — they're genuinely empty (a rank-7
Administrator account has none of that data populated). The em-dash
"—" (U+2014) used as the placeholder doesn't have a glyph in the
Habbo pixel font (Volter / Volter-Goldfish), so the engine falls
through to a placeholder glyph that on some font stacks looks like a
music note.

Two-part fix in ModToolsUserView (Field), ModToolsIssueInfoView
(Field) and ModToolsRoomView (owner fallback):

1. Replace the U+2014 em-dash with a plain ASCII `-`. Hyphen-minus is
   safely in Volter, so the placeholder renders correctly across the
   whole client.

2. The `value || placeholder` guard is now `(value || value === 0)`.
   Stat fields whose value is the literal number 0 — a clean account
   with cfhCount=0, banCount=0, cautionCount=0 — were rendering the
   placeholder because 0 is falsy. Treat 0 as a real value.

Also dropped the `italic` class on the placeholder span — the
hyphen does the job on its own and italic on a single-character
glyph in a pixel font was making it look like a tilted line.

src/components/mod-tools/views/tickets/ModToolsIssueInfoView.tsx

@@ -15,7 +15,7 @@ interface IssueInfoViewProps
 const Field: FC<{ label: string; children: React.ReactNode }> = ({ label, children }) => (
     <>
         <dt className="opacity-60 whitespace-nowrap">{ label }</dt>
-        <dd className="m-0 break-words font-medium">{ children || <span className="opacity-40 italic">—</span> }</dd>
+        <dd className="m-0 break-words font-medium">{ children || <span className="opacity-40">-</span> }</dd>
     </>
 );