components: FullScreenPicker uses the pinned bar

Completes the picker upstream: FullScreenPicker now passes largeTopBar=false
to CollapsingScaffold, so the family's selection pickers sit under a pinned
single-line bar instead of a tall collapsing header (the short list has nothing
to scroll past). Matches Calendula's scrollable-picker fix; applies family-wide.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -39,7 +39,9 @@ are no binary releases; "version" tracks the shared `version` in the root build
   - `OptionCard` — the sanctioned selection-dialog pick.
   - `CollapsingScaffold` — the collapsing settings/sub-screen scaffold; set
     `largeTopBar = false` for a pinned single-line bar (the picker variant).
-  - `FullScreenPicker` / `OptionPicker` — the full-screen single-select picker.
+  - `FullScreenPicker` / `OptionPicker` — the full-screen single-select picker,
+    now over a pinned single-line bar (a picker is a short list, so no tall
+    collapsing header to scroll past).
   - `ReorderableColumn` — dependency-free drag-to-reorder for the short, fixed
     grouped-card Settings lists; pairs with `GroupedRow(gapBelow = false)`, which
     hands the column uniform control of row spacing.