Merge: make the shell top bar hide/reveal with scroll, per tab

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

.claude/context/architecture.md

@@ -284,7 +284,21 @@ bare system prompt gives no context on its own.
   other tab has a create/upload flow), and the account avatar; Android
   gets a compact title row with `search`/avatar actions, relying on an
   extended `NooFab` ("Upload", Files/Photos only) instead of a top-bar
-  icon for upload. `BottomNavBar` (`widgets/bottom_nav_bar.dart`) adapts
+  icon for upload. Rather than one shared instance in `Scaffold.appBar`,
+  `MainShellView` builds a separate `AppTopBar` per tab (labelled for that
+  tab) and each tab plants its own as the first sliver in its own
+  `CustomScrollView` (`topBarSliver` in `widgets/tabs/tab_state_slivers.dart`,
+  wrapping it in the framework's `SliverFloatingHeader`) instead of passing
+  it to `Scaffold.appBar` - see that file's doc comment for why (Material's
+  native "floating" app bar behavior, tied to that tab's own
+  `ScrollController`: scrolls away as the list scrolls down and reappears
+  the moment the drag reverses, not only once scrolled back to the top).
+  `topBar` is null (no top bar rendered) on desktop and while picking,
+  matching `Scaffold.appBar`'s old `pickRequest == null` guard - see
+  `buildAppTabView`'s doc comment. It sits above each tab's own pinned
+  in-content header (the sort/filter controls row, or Files/Photos'
+  selection bar - see below); the two float/scroll independently.
+  `BottomNavBar` (`widgets/bottom_nav_bar.dart`) adapts
   the pinned `AppTab`s onto `NooBottomBar`. `AppDrawer`
   (`widgets/app_drawer.dart`) builds a `NooDrawer`: account block, storage
   meter, a "More" list of the hidden tabs, Settings, and an "Edit tabs"

.claude/context/styling.md

@@ -143,6 +143,12 @@ blocks are noted where they matter:
   `lib/widgets/tabs/` (`tab_state_slivers.dart`, `tab_day_groups.dart`,
   `tab_location.dart`) — the loading/error/empty-state slivers and
   day/month grouping helpers shared by Recent/Activity/Trash/Shares.
+  `tab_state_slivers.dart` also has `topBarSliver`, which every regular
+  tab's view uses to plant its own `AppTopBar` instance as the first sliver
+  in its `CustomScrollView` (a thin wrapper around the framework's
+  `SliverFloatingHeader`) instead of the shell passing one shared instance
+  to `Scaffold.appBar` - see its doc comment and `architecture.md`'s
+  "Mobile" bullet for why.
   `lib/widgets/settings/` — Settings' 8 section widgets plus
   `settings_section.dart`'s `SettingsSection`/`showSettingsPicker` and
   `settings_dialogs.dart`'s `confirmRemoveAccount`.