Stop reloading wallet page

**Describe the usability problem**
After 3 context switches to background and foreground app, MetaMask keeps defaulting to loading the wallet page rather than the last used page. E.g I’m keeping a browser tab open and switching apps. MetaMask will reload the wallet page and nullify any form data in the browser after 3 switches from background to foreground app.

**Expected behavior**
MetMask should keep track of what I was doing last and automatically save relevant context and load it. Should not default to wallet page if the app is in use.

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_filled out after submission_

**User impact | Usage frequency | Feasibility scores**
_How important is this to the user, what the user wants to accomplish | Daily, weekly, monthly | Small, medium, large_

No file, test, or entry point is named. Start by reproducing the reload after three background/foreground switches in the mobile app, then trace the navigation and state-restoration path. Done means preserving the last-used page and relevant form context instead of returning to Wallet.

Written by the indexing model from the issue text.