fix: analyzer warning in quicklinks_listview.dart

[kevmo314]

Fix the analyzer warning about using 'BuildContext' across async gaps in lib/components/drawer/quicklinks_listview.dart.

• Convert onLongPress to an async function.
• Replace the .then() call with await for Clipboard.setData.
• Add a check for mounted before calling ScaffoldMessenger.of(context).showSnackBar.

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[SputNikPlop]

@kevmo314 If this looks good feel free to merge it

[SputNikPlop]

@kevmo314 Ok I tried another attempt at finishing this off lemme know if it works