fix(web): hide resource subscription UI when server lacks subscribe capability (#1479)

* fix(web): hide resource subscription UI when server lacks subscribe capability (#1478)

Thread a `subscriptionsSupported` flag derived from
`capabilities?.resources?.subscribe === true` from App through
InspectorView → ResourcesScreen to the leaf components. When false:

- ResourcePreviewPanel hides the Subscribe/Unsubscribe button (Refresh
  stays).
- ResourceControls omits the Subscriptions accordion section entirely,
  dropping it from `allSections` so the expand/collapse-all toggle and
  open-section bookkeeping stay correct even if a stale "subscriptions"
  entry persists from a prior subscription-capable session.

The flag defaults to true at the leaf components so existing callers,
tests, and stories keep rendering the subscription controls unless a
server is explicitly marked unsupported.

Adds unit tests and Storybook stories covering the hidden and shown
states across all three components.

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

* fix(web): give the Servers screen scroll the same gutter/idle-hidden treatment (#1474)

The server grid's ScrollArea.Autosize used the default type="hover" with no
offsetScrollbars, so the scrollbar popped in on hover and overlaid the right
edge of the server cards (occluding their action icons / status badges) — the
same problem #1474 fixed for the History/Network/Logging list panels.

Apply the same `type="scroll"` + `offsetScrollbars` treatment, and reuse the
shared `expectScrollbarGutterIdleHidden` story assertion to regression-protect
the gutter + idle-hidden behavior.

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

* fix(web): stop the InspectorView shell from scrolling as a whole

AppShell.Main carried Mantine's default `padding="md"` on top of the
fixed-header offset, but every screen already sizes itself to
`calc(100vh - header)` and supplies its own `xl` padding (with no
allowance for Main's padding). That extra inset pushed screen content
past the viewport, so the whole InspectorView gained a page-level
scrollbar instead of confining overflow to each screen's inner
ScrollArea.

Set the shell `padding` to 0 (Main now contributes only the header
offset, matching what the screens were built for) and clamp the Main
slot to `height: 100dvh` with `overflow: hidden` in the theme, so the
view can never scroll regardless of content — only the inner ScrollArea
regions do.

Adds an InspectorView story play assertion guarding the invariant
(Main clips + is viewport-clamped) and a ManyServers fixture that
confirms it holds under enough content to overflow, with the inner
server-grid ScrollArea absorbing the overflow.

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

* fix(web): address review — align viewport units + drop stale subscriptions intent

Responding to the @claude review on #1479:

- Align all screen height calcs from `100vh` to `100dvh` so they match the
  Main slot's `100dvh` clamp. On a mobile viewport where `dvh < vh` a `100vh`
  child would have exceeded Main's `100dvh` content box and been clipped by
  `overflow: hidden`; the units are now in lockstep.
- Restrict `intendedButEmptySections` in ResourceControls to `allSections` so a
  stale "subscriptions" entry persisted from a prior subscription-capable
  session is dropped from persisted open-sections instead of being perpetually
  re-appended once the section is no longer rendered. Adds a regression test.

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

---------

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

clients/web/src/components/screens/ResourcesScreen/ResourcesScreen.tsx

@@ -35,6 +35,13 @@ export interface ResourcesScreenProps {
   ui: ResourcesUiState;
   listChanged: boolean;
   completionsSupported?: boolean;
+  /**
+   * Whether the connected server advertises the `resources.subscribe`
+   * capability. When false, the Subscribe/Unsubscribe button and the
+   * Subscriptions accordion section are hidden. Defaults to true so the
+   * controls render unless a caller explicitly marks them unsupported.
+   */
+  subscriptionsSupported?: boolean;
   onUiChange: (next: ResourcesUiState) => void;
   onRefreshList: () => void;
   onReadResource: (uri: string) => void;
@@ -67,7 +74,7 @@ export interface ResourcesUiState {
 
 const ScreenLayout = Flex.withProps({
   variant: "screen",
-  h: "calc(100vh - var(--app-shell-header-height, 0px))",
+  h: "calc(100dvh - var(--app-shell-header-height, 0px))",
   gap: "md",
   p: "xl",
 });
@@ -119,7 +126,7 @@ const EmptyState = Text.withProps({
 });
 
 const SCROLL_MAX_HEIGHT =
-  "calc(100vh - var(--app-shell-header-height, 0px) - var(--mantine-spacing-xl) * 2)";
+  "calc(100dvh - var(--app-shell-header-height, 0px) - var(--mantine-spacing-xl) * 2)";
 
 export function ResourcesScreen({
   resources,
@@ -129,6 +136,7 @@ export function ResourcesScreen({
   ui,
   listChanged,
   completionsSupported,
+  subscriptionsSupported = true,
   onUiChange,
   onRefreshList,
   onReadResource,
@@ -255,6 +263,7 @@ export function ResourcesScreen({
             contents={readState.result.contents}
             lastUpdated={readState.lastUpdated}
             isSubscribed={readState.isSubscribed ?? false}
+            subscriptionsSupported={subscriptionsSupported}
             onRefresh={() => handleReadResource(readResource.uri)}
             onSubscribe={() => onSubscribeResource(readResource.uri)}
             onUnsubscribe={() => onUnsubscribeResource(readResource.uri)}
@@ -275,6 +284,7 @@ export function ResourcesScreen({
             resources={resources}
             templates={templates}
             subscriptions={subscriptions}
+            subscriptionsSupported={subscriptionsSupported}
             selectedUri={selectedResourceUri}
             selectedTemplateUri={selectedTemplateUri}
             searchText={search}