fix(view tables): make ordering by a column visible and correct

[tkuhn]

Fixes #673.

Clicking a column header showed the "updating" spinner and gave no sign of what had been ordered.

The spinner

A sort is a reorder of rows the page already has — no query is made — but the click goes through Ajax like any other, and the client-side indicator in nanodash.js lights up for every Ajax call started inside a view panel. Worse, the response re-renders the header with fresh markup ids, so at /ajax/call/complete the trigger element is gone and the panel could not be found again; once shown, the spinner ran on until the 30s backstop, which is why a fast reorder looked like a long refresh.

• Sort calls are left out of the indicator (isTableReordering; header sort links are the only Ajax triggers inside a <th>).
• The panel a call belongs to is remembered from its start (pendingCalls), so no control that disappears in its own response can strand a spinner again — this also covers paging links.

The sign that something happened

Wicket marks the header cell with wicket_orderUp/wicket_orderDown/wicket_orderNone, but style.css had no rules for those classes, so nothing on screen changed except the row order. A caret now sits after the header label: solid ▲/▼ on the ordered column, greyed and only on hover for the others, with the space reserved so nothing shifts.

Columns with no header label are no longer sortable: an empty header was a live sort link, and the actions column offered to order the table by a property no row has.

Numeric ordering

Cells were compared with compareToIgnoreCase, i.e. digit by digit, so "10" came out above "9". The new Utils.compareValues compares values that are numbers throughout as numbers (decimals included — run-by-run comparison would put 1.5 below 1.25), and otherwise falls back to text order with each run of digits compared by value, so Session #9 < Session #34 and v1.9.0 < v1.10.0. Leading zeros are skipped, case is ignored as before, and ISO dates keep sorting correctly.

Verification

Driven in a browser against a local instance:

• with the Ajax round trip artificially slowed to 1.2s, sorting produced no spinner at any point, while filtering and paging still start and end theirs;
• the ordered header flips to wicket_orderUp/Down with a visible caret, and the actions headers are no longer links;
• a numeric column now reads 0, 1, 1, … ascending and 73, 12, 12, 12, 10, 9, 8, 8, 7, 7 descending (text order gave 9, 8, 8, 73, 7, 7, 12, …).

Four comparator tests added to UtilsTest; full suite 1236 tests, 0 failures.

🤖 Generated with Claude Code

https://claude.ai/code/session_01UToMqDvcVRgpwHojAx69t1