fix: salvage a list result's valid entries when one is malformed (#1909)

The SDK validates a list result as a whole, so a single non-conforming entry
rejected the entire response and the panel showed "Couldn't load resources"
with zero items — the exact opposite of what a debugging tool should do with a
server that is 90% right. Reported against a PHP server whose empty
`annotations` object reaches the wire as `[]` rather than `{}`.

`listAll*` now falls back to a lenient re-walk when — and only when — the SDK
rejects a result it received (`InvalidResult` / `UnsupportedResultType`), keeps
the entries that validate, and reports the rest. A conforming server takes the
strict, cache-aware path exactly as before.

Salvaging is not accepting: the dropped entries are named with their reason in
a warning above the list, and the Protocol entry is still marked rejected, so
the wire truth survives. When every entry validates, the original error is
rethrown rather than swallowed — the rejection was about something the
per-item pass cannot explain.

`isClientDecodeRejection` moves to the new module and is now shared with
managedListState, which had the only copy.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HDdo1rNRVQnVRRdsqSrvG3
Signed-off-by: cliffhall <cliff@futurescale.com>

clients/web/src/components/views/InspectorView/InspectorView.tsx

@@ -6,6 +6,7 @@ import {
   type ReactNode,
   type Ref,
 } from "react";
+import type { MalformedListItem } from "@inspector/core/mcp";
 import type { DeepLink, DeepLinkParseStatus } from "../../../utils/deepLink";
 import {
   AppShell,
@@ -418,6 +419,11 @@ export interface InspectorViewProps {
   /** Tools excluded from `tools/list` for invalid `x-mcp-header` annotations
    * (SEP-2243); shown in the Tools sidebar with the reason (#1632). */
   excludedTools?: ExcludedTool[];
+  /**
+   * Entries dropped from a list result as malformed, across every list method.
+   * Each list panel filters for its own and warns about them (#1909).
+   */
+  malformedListItems?: MalformedListItem[];
   prompts: Prompt[];
   resources: Resource[];
   resourceTemplates: ResourceTemplate[];
@@ -632,6 +638,7 @@ export function InspectorView({
   latencyMs,
   tools,
   excludedTools = [],
+  malformedListItems = [],
   prompts,
   resources,
   resourceTemplates,
@@ -1365,6 +1372,7 @@ export function InspectorView({
               <ToolsScreen
                 tools={tools}
                 excludedTools={excludedTools}
+                malformedListItems={malformedListItems}
                 callState={toolCallState}
                 ui={toolsUi}
                 listChanged={toolsListChanged}
@@ -1405,6 +1413,7 @@ export function InspectorView({
             <ScreenStage active={activeTab === "Prompts"}>
               <PromptsScreen
                 prompts={prompts}
+                malformedListItems={malformedListItems}
                 getPromptState={getPromptState}
                 ui={promptsUi}
                 listChanged={promptsListChanged}
@@ -1421,6 +1430,7 @@ export function InspectorView({
             <ScreenStage active={activeTab === "Resources"}>
               <ResourcesScreen
                 resources={resources}
+                malformedListItems={malformedListItems}
                 templates={resourceTemplates}
                 subscriptions={subscriptions}
                 subscriptionStreamState={subscriptionStreamState}