feat(model-picker): description on group layer, plain labels on members

For grouped provider families, the descriptive text now lives only on the
collapsed top-level group row. The member sub-picker rows show just the
short provider label (no parenthetical tui_desc), so the description is not
duplicated one layer down.

Ungrouped providers are unaffected — they have no group layer, so their own
row keeps its full tui_desc.

- main.py: member sub-picker uses provider_labels (label) instead of
  canonical_descs (tui_desc).
- Telegram already showed labels + model count on member buttons; group
  buttons keep Label ▸ (count) since inline keyboards can't fit a long blurb.

Member labels retain their short disambiguators (e.g. 'MiniMax (OAuth)') so
the sub-picker rows stay distinguishable.

hermes_cli/main.py

@@ -2485,13 +2485,14 @@ def select_provider_and_model(args=None):
     selected_members = ordered[provider_idx][2]
 
     # Group row → drill into a member sub-picker. Default to the active member
-    # if the active provider lives in this group.
+    # if the active provider lives in this group. The descriptive text lives on
+    # the group row itself, so member rows show only their short label here.
     if selected_members:
         member_default = 0
         if active in selected_members:
             member_default = selected_members.index(active)
         member_labels = [
-            canonical_descs.get(m, provider_labels.get(m, m)) for m in selected_members
+            provider_labels.get(m, m) for m in selected_members
         ]
         member_idx = _prompt_provider_choice(member_labels, default=member_default)
         if member_idx is None: