Task #352: Make logo upload always visible for admin users

Previously, the logo upload field in Font Settings was hidden behind two
conditions: canEditGlobal AND scope === "global". Admin users had to
first switch the scope dropdown to "Global" before the logo upload
appeared, making it very hard to discover.

Changes:
- Frontend (executive-meetings.tsx): Removed `scope === "global"`
  condition from logo upload rendering — now shows whenever
  `canEditGlobal` is true (admin/executive_office_manager).
- Frontend: Save function now always sends `logoObjectPath` when
  `canEditGlobal` is true, regardless of selected scope.
- Backend (executive-meetings.ts): When an admin saves with user scope
  and includes logoObjectPath, the logo is written to the global row
  (upsert) in the same transaction. This preserves the global-only
  semantics while allowing admins to update the logo from any scope.
- When no global row exists, new row uses safe defaults (system font,
  14px, regular, start, #000000) instead of copying the user's prefs.
- Removed the 400 rejection for logoObjectPath on user-scope saves.
- Authorization preserved: only EM_ADMIN_ROLES can trigger logo writes.

Tested:
- API: PATCH with scope=user + logoObjectPath correctly updates global row
- E2E: Logo upload field visible for admin in user scope (confirmed)
- Code review: APPROVED (addressed comment about safe defaults)
- Pre-existing test failures unchanged (PDF font assertion, notification tests)

artifacts/api-server/src/routes/executive-meetings.ts

@@ -2965,11 +2965,11 @@ const upsertFontSettingsHandler = async (
           .values({
             scope: "global",
             userId: null,
-            fontFamily: data.fontFamily,
-            fontSize: data.fontSize,
-            fontWeight: data.fontWeight,
-            alignment: data.alignment,
-            fontColor: data.fontColor,
+            fontFamily: "system",
+            fontSize: 14,
+            fontWeight: "regular",
+            alignment: "start",
+            fontColor: "#000000",
             logoObjectPath: data.logoObjectPath ?? null,
           });
       }