# 071 — Filter bar's syntax button/popup is ugly and incoherent

## Summary

Wishlist feedback, verbatim: "UI filter ugly syntax. The button moved
to the right, away from the existing button cluster. The popup is a
incoherent mess and should be clearer."

Two distinct complaints bundled together:

1. Layout regression — some button (the filter-help/syntax button,
   presumably introduced or moved by ticket 065's filter-bar help
   rewrite) now sits away from the rest of the filter bar's button
   cluster in `FilterBar.tsx` (`webapp/src/components/FilterBar.tsx`,
   currently 67 lines), instead of grouped with the others.
2. Content/clarity — whatever popup that button opens (the filter
   syntax help introduced/reworked in ticket 065,
   "filter-bar-help-should-describe-filter-syntax-not-regex") reads as
   an incoherent mess rather than a clear reference.

## Scope

- Reproduce in the running app: open the filter bar, locate the
  syntax/help button, and confirm which button has drifted from the
  cluster and what "incoherent" means concretely (wall of text?
  disorganized sections? unclear examples?) — the wishlist entry
  doesn't specify, so this needs eyes-on before a fix.
- Fix the button's position so it's grouped with the filter bar's other
  controls again.
- Rework the popup's content/layout for clarity — likely restructuring
  into clearly separated sections (e.g. by filter feature: regex match,
  metric comparison, datetime, sort) with short examples per section,
  rather than a single undifferentiated block.
- Out of scope: changing the underlying filter grammar itself
  (`filter_parser.pest`/`filter_parser.rs`) — this is presentation only.

## Acceptance criteria

- The filter syntax button sits back with the filter bar's other
  buttons, not isolated to one side.
- The help popup reads as a structured, scannable reference rather than
  a single dense block — verified visually in the running app (`make
  dev`), not just by inspecting JSX.

## Depends on

None. Touches the same area as ticket 065 and ticket 066
("filter-bar-value-doesnt-reflect-active-preset-or-sort") — check those
haven't already reshuffled this layout before starting.