Change Details

Designs are from [DES-8](https://linear.app/comm/issue/DES-8/design-desktop-app-loading-screen). This is the first step to [fixing SSR on web](https://linear.app/comm/issue/ENG-2513/fix-ssr-on-web)... basically we need to align keyserver/web on some loading HTML. This can be used in other places, but for now I'm introducing it to use while `redux-persist` is loading. In a subsequent diff, I'll pass it down via SSR.

Designs are from [DES-8](https://linear.app/comm/issue/DES-8/design-desktop-app-loading-screen); see Figma animation [here](https://www.figma.com/proto/a1nkbWgbgjRlrOY9LVurTz/Comm-%2F-Desktop-app?page-id=6227%3A104248&node-id=6285%3A104258&viewport=166%2C745%2C0.06&scaling=min-zoom&starting-point-node-id=6285%3A104248&show-proto-sidebar=1). This is the first step to [fixing SSR on web](https://linear.app/comm/issue/ENG-2513/fix-ssr-on-web)... basically we need to align keyserver/web on some loading HTML. This can be used in other places, but for now I'm introducing it to use while `redux-persist` is loading. In a subsequent diff, I'll pass it down via SSR.

Designs are from [DES-8](https://linear.app/comm/issue/DES-8/design-desktop-app-loading-screen); see Figma animation [here](https://www.figma.com/proto/a1nkbWgbgjRlrOY9LVurTz/Comm-%2F-Desktop-app?page-id=6227%3A104248&node-id=6285%3A104258&viewport=166%2C745%2C0.06&scaling=min-zoom&starting-point-node-id=6285%3A104248&show-proto-sidebar=1). This is the first step to [fixing SSR on web](https://linear.app/comm/issue/ENG-2513/fix-ssr-on-web)... basically we need to align keyserver/web on some loading HTML. This can be used in other places, but for now I'm introducing it to use while `redux-persist` is loading. In a subsequent diff, I'll pass it down via SSR.