Consolidate tab persistence logic into Tabs component

- Move active tab persistence into Tabs component with storageKey + activeTabKey props
- Change value prop to defaultValue so callers don't manage tab state
- Add TabsRef with setActiveTab method for programmatic tab switching
- Restore request_pane.focus_tab listener for :param placeholder clicks
- Update all Tab consumers to use new pattern

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src-web/components/Settings/Settings.tsx

@@ -5,7 +5,6 @@ import { useLicense } from '@yaakapp-internal/license';
 import { pluginsAtom, settingsAtom } from '@yaakapp-internal/models';
 import classNames from 'classnames';
 import { useAtomValue } from 'jotai';
-import { useState } from 'react';
 import { useKeyPressEvent } from 'react-use';
 import { appInfo } from '../../lib/appInfo';
 import { capitalize } from '../../lib/capitalize';
@@ -51,7 +50,6 @@ export default function Settings({ hide }: Props) {
   const { tab: tabFromQuery } = useSearch({ from: '/workspaces/$workspaceId/settings' });
   // Parse tab and subtab (e.g., "plugins:installed")
   const [mainTab, subtab] = tabFromQuery?.split(':') ?? [];
-  const [tab, setTab] = useState<string | undefined>(mainTab || tabFromQuery);
   const settings = useAtomValue(settingsAtom);
   const plugins = useAtomValue(pluginsAtom);
   const licenseCheck = useLicense();
@@ -91,11 +89,10 @@ export default function Settings({ hide }: Props) {
       )}
       <Tabs
         layout="horizontal"
-        value={tab}
+        defaultValue={mainTab || tabFromQuery}
         addBorders
         tabListClassName="min-w-[10rem] bg-surface x-theme-sidebar border-r border-border pl-3"
         label="Settings"
-        onChangeValue={setTab}
         tabs={tabs.map(
           (value): TabItem => ({
             value,
@@ -145,7 +142,7 @@ export default function Settings({ hide }: Props) {
           <SettingsHotkeys />
         </TabContent>
         <TabContent value={TAB_PLUGINS} className="h-full grid grid-rows-1 px-6 !py-4">
-          <SettingsPlugins defaultSubtab={tab === TAB_PLUGINS ? subtab : undefined} />
+          <SettingsPlugins defaultSubtab={mainTab === TAB_PLUGINS ? subtab : undefined} />
         </TabContent>
         <TabContent value={TAB_PROXY} className="overflow-y-auto h-full px-6 !py-4">
           <SettingsProxy />

src-web/components/Settings/SettingsPlugins.tsx

@@ -54,13 +54,11 @@ export function SettingsPlugins({ defaultSubtab }: SettingsPluginsProps) {
   const installedPlugins = plugins.filter((p) => !isPluginBundled(p, appInfo.vendoredPluginDir));
   const createPlugin = useInstallPlugin();
   const refreshPlugins = useRefreshPlugins();
-  const [tab, setTab] = useState<string | undefined>(defaultSubtab);
   return (
     <div className="h-full">
       <Tabs
-        value={tab}
+        defaultValue={defaultSubtab}
         label="Plugins"
-        onChangeValue={setTab}
         addBorders
         tabs={[
           { label: 'Discover', value: 'search' },