Make unlocking file contents more discoverable

Version and Platform (required):

• Binary Ninja Version: 3.0.3387-dev
• OS: macOS
• OS Version: 12.3.1
• CPU Architecture: M1 (arm64)

Bug Description:
When you go to type bytes into hex view, the "Click to Unlock File Contents" option pops up off the bottom-right of the window and is un-clickable.

Steps To Reproduce:

1. Open Hex View
2. Type something (I've been using '3') into the window
3. Observe that the "Click to Unlock File Contents" option pops up, but off the bottom-right of the current window
4. Also observe that even if you position your mouse over it, you can't click it

Expected Behavior:

The option should pop up somewhere within the window (ideally near my mouse cursor) and be clickable so that I can unlock the file contents.

Screenshots:

I can't seem to get the option to stay popped up long enough to get a screenshot...

Additional Information:

I also don't see an option in the command palette, hamburger menu, or right-click context menu for unlocking file contents? So, I'm actually not even sure how to do this now...

Start by reproducing the issue from the Hex View entry point using the listed steps on macOS. Inspect how the “Click to Unlock File Contents” option is positioned and activated, then verify that it remains within the window and can be clicked to unlock the file contents.