Add table filtering/sorting to columns themselves

[akira69]

Filaman's current implementation has filtering of tables provided by selection in the header, separated from the table iteslf. This is fine, but removes some workflows and limits filterability.

Improve the filtering/selection within tables by enabling filtering and sorting for every column on the column header itself

For reference in spoolman:
individual column filter and sorting button enabled

[akira69]

Status update — what's landed upstream:

✅ Column re-ordering (v1.2.7)
✅ Column resizing with persistence (v1.2.12)
✅ Extra fields selectable as visible columns (v1.1.18)
✅ Correct sort on spool-count and other server-side columns (akira69#13, merged upstream)
Still open: Per-column filter inputs directly on the header (the Spoolman-style individual filter widget per column). This remains unimplemented. Given the sorting and extra fields work is done, this is the most meaningful remaining step from the original proposal.