feat(leads): stabilize v3 layout and unify tab width logic

- Removed max-width constraints across leads modules for full-width stability.
- Fixed duplicate Download icon import causing build errors.
- Improved header responsiveness for mobile-first experience.
- Refined tab switching logic with state persistence placeholders.

src/routes/journals/[journal_id]/+layout.svelte

@@ -281,7 +281,7 @@ Middle-click to open in new tab`}
                                 );
                             }
                             $journals_slct.journal_entry_id =
-                                results?.journal_entry_id_random;
+                                results?.journal_entry_id;
                             // $journals_loc.entry.edit = true;
                             $journals_loc.entry.edit_kv[
                                 $journals_slct.journal_entry_id