UI: generator selection groups, group hide/delete management, chip-row collapse

[ernop]

Summary

Adds a selection-group system to the --ui composer's generator chooser, per owner request:

• Group buttons beside the basic actions (relabeled all / none / invert): built-in defaults (the standard text-job default set from /api/config defaultOn) and image defaults (new defaultOnWithImage — same tiers with text-only Ideogram V4 swapped for image-capable Ideogram V3), plus any user-saved groups. Clicking a group applies it as a complete media-section selection (listed models on, everything else off; disabled chips stay unchecked). Groups never touch the describe section, preserving the "Enable all can't fan out to paid describe endpoints" rule.
• save group… captures the current selection under a chosen name (same name = overwrite). Stored per-browser in mic_ui_settings_v1 (genGroups).
• Settings panel management: a "model group buttons" block lists every button (including all/none/invert and the two built-ins) with a shown/hidden checkbox; user-saved groups also get delete. Hidden ids persist as hiddenGenGroups.
• Compact view: hide models collapses the media chip row so the group buttons are the whole chooser, with an "N selected" summary; the describe head gets the same hide toggle for its chips. Both persist (gensRowCollapsed / describeRowCollapsed).
• Attaching an image never rewrites the current selection — "image defaults" is an explicit preset, applied only by clicking.

Server change

UiWorkflow.cs /api/config now carries defaultOnWithImage per generator alongside defaultOn. No behavior change for existing clients; initial checked state on a fresh window is still defaultOn.

Testing

Live browser walkthrough on a local --ui instance (placeholder keys so chips are available): group apply/save/restore, hide/delete management with instant composer sync, reload persistence, describe-section toggle — all pass; console clean. One bug found and fixed during testing: the rows' display: grid outranked the UA [hidden] rule, so collapsing never visually hid the chips (#gens-row[hidden], #describe-row[hidden] { display: none; }). dotnet test: 57/57 pass.

Composer with group buttons
Saved custom group button
Collapsed model chips — group buttons only
Settings: model group buttons management
Describe section with hide toggle

Services affected

None — UI composer + config surface only. No provider calls change.

Settings

No settings.json changes required.

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