[Zakkaus]

Follow-up to #550, which merged before this commit was pushed.

Problem

The process field's description line from #550 is wider than the field, so it widens the field's grid cell in the route trace's advanced conditions and pushes DSCP onto a new row.

How I fixed it

The explanation moves into the label's help button (help on TextField). A field label row with a help button now keeps the label's own font size and line height, so the 24 px button no longer pushes its input below the neighbouring inputs.

Verified

• Mock preview, 1280 px: the four advanced inputs (source IP, source port, process, DSCP) share one row, top 414 px, width 164 px each; light and dark checked, popover text checked.
• pnpm check passed; the e2e gate ran on fix(rules): trace a blank process as traffic without one #550's branch with this commit before the merge.

After light, help open, after dark:

Submitted and answered for by (Human responsible, GitHub username): @Zakkaus

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• I ran the applicable CI gates in CONTRIBUTING.md; the Verified section records the commands, results and any checks I could not complete.
• I updated the strings in en.json and in every complete language's catalogue when I changed interface text.
• I attached light and dark screenshots when I changed the interface appearance.
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