Fix share copy-link, destination-picker filters, and type-filter UX

- SharesController's fetchShares() built NextcloudShare objects through
  its own thin inline parser instead of _shareFromJson, so url/token/
  permissions/expireDate were always null - a public link share could
  never show "Copy link" in the Shares tab. Reuses _shareFromJson.
- Upload/Move/Copy's destination picker hid External storage in its
  filter sheet (showStorageScope: false) unlike Files' own controls
  row, despite the design doc already calling for full parity.
- Files' and Photos' type filter (All/Files/Folders, All/Photos/Videos)
  now render as one consistent style in both filter sheets: every icon
  always shown, label only on the selected segment
  (NooSegmentedControl's new labelOnlySelected), replacing Files' old
  checkmark list and Photos' own always-labelled track.
- Fixes Photos' type filter only visually updating after closing and
  reopening the filter sheet - it lived on PhotosView's own State, so
  Listenable.merge([photos, files]) never rebuilt the sheet when it
  changed; a StatefulBuilder now gives it that trigger.
- Replaces Settings' trailing section jump rail with per-section
  collapsible cards (NooGroupedList's new collapsible param, expanded
  by default) - one less parallel way to navigate a long screen.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.claude/context/design-system/DESIGN_SYSTEM.md

@@ -321,8 +321,13 @@ Sidebar items are 38px tall with radius 12, an 18px icon and a 14/500 label. The
   (All, Photos, Videos - Camera isn't backed by real data, see the view's
   doc comment) lives inside the filter sheet as a full-width segmented
   control, the same "label, then the control on its own row below" shape
-  Settings' Theme row uses, not its own row of chips. Then the photo grid
-  grouped by month.
+  Settings' Theme row uses, not its own row of chips. Every icon (All,
+  Photos, Videos in the filter sheet; All, Files, Folders in Files' own
+  filter sheet, same treatment) always shows; only the *selected* segment
+  also shows its label (`NooSegmentedControl`'s `labelOnlySelected`) - the
+  same List/Grid-toggle-style pill both screens' filter sheets use, not
+  Files' old checkmark list or Photos' own always-labelled track. Then the
+  photo grid grouped by month.
 - **Favorites:** a file list with a star as the trailing icon.
 - **Offline:** a summary card (or 4 stat cards on desktop), then a list whose rows show sync status icons and status meta.
 - **Shares:** a segmented control (With you, By you, Links), then a list. The meta reads "Owner · Permission".
@@ -344,12 +349,15 @@ Sidebar items are 38px tall with radius 12, an 18px icon and a 14/500 label. The
      slots, the rest sit behind "More". See §2 "Selection action bar".
   9. Swipe on a file
 
-  Mobile uses one column of grouped lists, with a trailing jump rail (one
-  small icon per section, pinned where the scrollbar would sit) since the
-  full list runs long enough that scrolling to a specific section by hand
-  is slow - tapping an icon scrolls straight to that section. Desktop uses
-  a 2-column grid of cards with a 1px line and radius 20, wide enough to
-  see most sections without scrolling, so it doesn't get the rail.
+  Mobile uses one column of grouped lists, each individually collapsible
+  (tap its label, expanded by default - `NooGroupedList`'s `collapsible`
+  param) so the full list can be collapsed down instead of needing a
+  separate way to navigate it; an earlier version had a trailing jump rail
+  (one small icon per section, pinned where the scrollbar would sit)
+  instead, dropped for adding a second, redundant navigation method without
+  shortening the page. Desktop uses a 2-column grid of cards with a 1px
+  line and radius 20, wide enough to see most sections without scrolling,
+  so it gets neither.
 - **Share sheet / dialog:** sections in this order:
   1. Header: file tile, name, size · folder, and close.
   2. **Share with people:** an input ("Name, email or group"), then the people with access. The owner comes first; the others each have a permission pill ("Can edit ▾").

.claude/context/styling.md

@@ -89,7 +89,9 @@ Gotchas:
   `drawerScrimColor: context.nooColors.scrim`.
 - `NooGroupedList` draws dividers by showing `line` through 1px gaps, so each
   child must paint its own surface (`NooSettingsRow` and `NooTabOrderRow`
-  do).
+  do). Its `collapsible`/`initiallyExpanded` params (off by default) make
+  `label` a tap target that shows/hides the card - `SettingsSection` is the
+  only caller that opts in, for Settings' mobile sections.
 - `NooSwipeAction` only reveals its action. The user has to tap the block to
   trigger it; a full swipe never deletes.
 - Window chrome (macOS traffic lights, the Windows 40px title bar) isn't