Phase 1: Style refinements and component tweaks from Storybook review

Theme & styling:
- Add custom "inspector" color palette with dark navy primary
- Change primaryShade to { light: 7, dark: 8 }
- Add Input theme override to apply --inspector-input-background globally
- Add --inspector-input-background token (white in light, dark-9 in dark)
- Override --mantine-color-body in dark mode via cssVariablesResolver
  in both main.tsx and Storybook preview.tsx
- Add dark-mode CSS overrides for Select dropdown and option hover
- Add dark-mode CSS override for Accordion control hover
- Rename CSS variable --inspector-status-failed → --inspector-status-error

Component changes:
- CopyButton: increase icon font size to 24px, use --inspector-text-primary
  for high-contrast color (black/white per theme)
- TaskControls: remove onClearHistory (moved to TaskListPanel), fix Select
  clear button not disappearing by passing null instead of undefined
- TaskListPanel: add onClearCompleted callback, render "Clear" button
  next to Completed section header
- HistoryListPanel: move "Clear" button from toolbar to History section
  header, rename from "Clear All"

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

clients/web/src/components/groups/ResourceControls/ResourceControls.tsx

@@ -93,16 +93,16 @@ export function ResourceControls({
         <ListChangedIndicator visible={listChanged} onRefresh={onRefreshList} />
       </Group>
       <Group gap="xs" wrap="nowrap">
-        <ListToggle
-          compact={!allExpanded}
-          onToggle={() => setOpenSections(allExpanded ? [] : [...allSections])}
-        />
         <TextInput
           flex={1}
           placeholder="Search..."
           value={searchText}
           onChange={(e) => setSearchText(e.currentTarget.value)}
         />
+        <ListToggle
+          compact={!allExpanded}
+          onToggle={() => setOpenSections(allExpanded ? [] : [...allSections])}
+        />
       </Group>
       <Accordion multiple value={openSections} onChange={setOpenSections}>
         <Accordion.Item value="resources">