Clicking a heading sorted the table but nothing said so afterwards - the
only feedback was the rows moving, which is no help when the sort key is a
column you are not looking at.
Give every sortable heading a permanent marker: a neutral double arrow when
it is not the sort key, up or down when it is. The marker sits in its own
span so the i18n pass, which replaces the heading text, does not wipe it.
The table lists every learned and static entry in one flat block, which is
fine with a handful and unusable with a few hundred: finding out where one
MAC sits, or what a port has learned, meant reading the whole thing.
Make the column headings sort and give each one a filter box. Filters are
substring matches combined with AND, so "port 8 + static" is two keystrokes.
A counter above the table shows matched out of total, so a filter that hides
everything is obvious rather than looking like an empty table.
Sorting keeps the CPU entry from comparing as a number - it sorts last
instead of landing between ports 8 and 9, where a string-vs-number compare
would otherwise put it.
The filter inputs live inside the existing header cells rather than in a
second row: the paint loop addresses data rows as rows[i+1], and a second
header row would have shifted every one of them.
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