Page Zoom: "%" sign wraps below the input on Linux

[kands-code]

Issue Description

In Settings → General, the "%" next to the Page Zoom number field
wraps onto a second line and renders below the input box, half outside
its border.

Expected Behavior

"100 %" stays on one line inside the box, as it does on macOS and on mobile.

Actual Behavior

Reproduction Steps

1. Open Settings -> General on Linux (tested with Brave/Chromium).
2. Look at the "Page Zoom" row.

Environment

- Cinny version: 4.12.6
- OS: Linux (Arch), Brave browser 1.94.117
- Works correctly on: macOS Brave, Android Brave

Relevant Logs

None

Additional context

Why it happens
The box wrapping the <input> and the "%" has a fixed width
(6.25rem ≈ 100 px) and flex-wrap: wrap. The input's own width is
not set explicitly — it comes from size="1", which depends on the
browser's default form font, plus the width of the number input's
spinner arrows on desktop. Both differ across platforms. On Linux the
input ends up a few pixels wider, the "%" no longer fits, wraps below,
and overflows the fixed-height (32 px) box.

Suggested fix
Any of these would work:

• set flex-wrap: nowrap on the box, or
• give the input an explicit flexible width (min-width: 0; flex: 1;), or
• don't hard-code the box width.

I acknowledge that:

• I have searched the Cinny repository (both open and closed Discussions and Issues) and confirm this is not a duplicate of an existing issue or discussion.
• I have checked the "Preview" tab on all text fields to ensure that everything looks right, and have wrapped all configuration and code in code blocks with a group of three backticks (```) on separate lines.

[kfiven]

Fixes by cinnyapp/folds#152