Reword wallet chooser permission dialog copy

[djscruggs]

Summary

• Replace the abstract "wants to manage credentials for you" permission-dialog copy with concrete, jargon-free language: "wants to appear as an option when you're asked to share or store information on other websites."
• Bump version to 7.5.2 and add a CHANGELOG entry.

Test plan

• npx eslint web/components/MediatorGreeting.vue passes
• Rendered the permissionRequest dialog state via the /test/wallet-chooser?type=permissionRequest dev harness on desktop (chromium) and mobile (iPhone) viewports — new copy wraps to 2-3 lines with no overflow or button crowding
• npm run gallery (wallet chooser hint-list states) still passes

Addresses #150.

[dlongley]

We need some screenshots of this on different browsers to see how it looks -- and it might require popup size adjustments too.

[djscruggs]

@dlongley here are screenshots

Desktop popups

Chromium

Firefox

WebKit / Safari

Mobile

iPhone

Android / Pixel

[dlongley]

Heh, well, those look terrible :P. We'll need to do something about all that empty space.

[djscruggs]

The empty space isn't from the reworded copy — it's the modal's built-in mobile behavior in vue-web-request-mediator.

In upstream style/main.less, any .wrm-modal that isn't the 1p wallet-chooser goes full-screen below the small-screen breakpoint (~430px wide):

@media only screen and (max-width: @wrm-modal-small-screen) { // 400px + 30px padding = 430px
  &:not(.wrm-modal-1p) {
    height: 100%;
    justify-content: flex-end;
  }
}

So on any narrow viewport the modal is forced to height: 100% with content pinned to the bottom (justify-content: flex-end). The permission dialog has very little content, so "fill the screen" leaves a big gap between the origin card and the Block/Allow buttons. The desktop shots (chromium/firefox at 500px wide) clear the breakpoint, stay content-sized, and look fine.

This is independent of the text — the previous copy wasn't long either, so it would have shown the same gap on mobile. The reword just drew the eye to it.

Before I fix it: on mobile, do you want the permission dialog to (a) shrink to a compact card like it does on desktop, or (b) stay a full-screen sheet with the buttons anchored at the bottom, just without the awkward gap? I'd lean toward (a) since there's no scrollable list here, but it's your call on the intended mobile look.

[dlongley]

Ok, I understand that those screenshots were for mobile now. Let's leave that be in this PR -- we can consider ways to improve the appearance on mobile later.

What do the desktop screenshots look like? Do they overflow/crowd out the buttons or anything, or do they also look ok?