fix: add accessible names to icon-only buttons

[defidough]

General Changes

• Adds translated aria-labels to 10 icon-only IconButtons that screen readers announced as just "button": modal close, clear amount, clear search, mobile search toggle, info tooltip trigger, market favourite star, bridge network switch, migration market menu, and the two explorer links (token contract, bridge tx).
• The two explorer links sit inside DarkTooltip, which looks like it names them but doesn't: it wraps title in a Box, and MUI only applies title as aria-label when it's a string. They now get the tooltip text as their label.
• TextWithTooltip gets an optional iconLabel prop (default "More information"), so callers that render a warning icon can name it.
• Adds a jest guard that fails when an IconButton has no accessible name (a plain MUI Tooltip with a string title counts, since MUI applies it as aria-label; DarkTooltip does not).
• Regenerated catalogs with pnpm i18n.

Developer Notes

Swap input controls are intentionally untouched. They're tracked in #3100, and the guard lists their exact file:line in KNOWN_UNLABELLED, so whoever fixes #3100 removes those entries, and a new unlabelled button in those files still fails. The guard is a static TypeScript-AST check rather than a render test because lingui macros aren't compiled under the jest transformer. No visual changes.

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