Return to using Fira Code as the default monospace font (#31302)

* Return to using Fira Code as the default monospace font.

because Inconsolata lacks Box Drawings and Geometric Shapes glyphs.
Fixes https://github.com/element-hq/element-web/issues/31289
Partially reverts https://github.com/matrix-org/matrix-react-sdk/pull/3008

* fix quotes

* fix tests

* fix quotes

* appease prettier

* fix snapshot tests, hopefully

* more snapshots

playwright/e2e/user-view/user-view.spec.ts

@@ -24,7 +24,7 @@ test.describe("UserView", () => {
             css: `
                 /* Use monospace font for consistent mask width */
                 .mx_UserInfo_profile_mxid {
-                    font-family: Inconsolata !important;
+                    font-family: "Fira Code" !important;
                 }
             `,
         });