feat(config): redo config tab — lazy list, full-coverage search, per-field reset (#898)
- LazyColumn + precomputed flat dot-path value map: O(1) lookups, only
visible fields compose (829 live leaves on a real config)
- Search now matches keys, labels, descriptions, categories, CURRENT
values and select options; non-schema ('Other') paths are searchable too.
Result count + category chip per hit while searching
- Per-field reset-to-default icon; clear-to-blank honoring schema
'clearable'; searchable dropdown honoring schema 'searchable'
(select-all-free fresh filter, exact-match commits on blur)
- Number/object/list editors keep local text state: intermediate typing
('0.') no longer drops keystrokes; objects/lists edit as multi-line JSON
with validation
- Honor backend searchable/clearable schema flags (SchemaField model)
- Category reset now previews default values immediately
Co-authored-by: M57 <hy4ri@users.noreply.github.com>
