Both-version flavour text; refresh detail page on game switch

- FlavorText: shows a version pill toggle (Sword/Shield, Scarlet/Violet…)
  when the two entries differ, sliding between them; collapses identical
  entries; falls back to the newest English entry, captioned
- Switching games while viewing a Pokémon now rebuilds the detail page
  (router.rerender wired from a settings subscription in main.js) so
  flavour text, learnset, matchups, evolution, abilities, locations and
  era sprites all follow the newly selected game

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

src/components/FlavorText.js

@@ -0,0 +1,74 @@
+import { el } from '../lib/dom.js';
+import { prettify } from '../data/pokedex-resolver.js';
+
+/**
+ * Pokédex flavour text for the selected game. Most games ship two versions
+ * (Scarlet/Violet, Sword/Shield…) with different entries — show a pill
+ * toggle and slide between them. Falls back to the most recent English
+ * entry when the game itself has none.
+ */
+export function FlavorText(species, vg) {
+  const versions = vg ? vg.versions : [];
+  const english = species.flavor_text_entries.filter((f) => f.language.name === 'en');
+
+  const byVersion = new Map();
+  for (const f of english) {
+    if (!byVersion.has(f.version.name)) {
+      byVersion.set(f.version.name, f.flavor_text.replace(/\s+/g, ' '));
+    }
+  }
+
+  let picks = versions
+    .filter((v) => byVersion.has(v))
+    .map((v) => ({ version: v, text: byVersion.get(v) }));
+
+  // Collapse identical entries (both versions often share the same text).
+  const seen = new Set();
+  picks = picks.filter((p) => (seen.has(p.text) ? false : seen.add(p.text)));
+
+  if (!picks.length && english.length) {
+    const last = english[english.length - 1];
+    picks = [{ version: last.version.name, text: last.flavor_text.replace(/\s+/g, ' '), fallback: true }];
+  }
+  if (!picks.length) return null;
+
+  const quote = el('p', { class: 'ppanel__flavor' });
+  const caption = el('span', { class: 'flavor__cap' });
+  const toggle = el('div', { class: 'flavor__toggle' });
+  let index = 0;
+
+  function paint() {
+    const p = picks[index];
+    quote.textContent = p.text;
+    quote.style.animation = 'none';
+    // eslint-disable-next-line no-unused-expressions
+    quote.offsetWidth;
+    quote.style.animation = '';
+    caption.textContent = p.fallback
+      ? `— ${prettify(p.version)} (most recent)`
+      : `— Pokémon ${prettify(p.version)}`;
+    [...toggle.children].forEach((b, i) => b.classList.toggle('is-active', i === index));
+  }
+
+  if (picks.length > 1) {
+    picks.forEach((p, i) =>
+      toggle.append(
+        el(
+          'button',
+          {
+            class: 'flavor__pill',
+            type: 'button',
+            onclick: () => {
+              index = i;
+              paint();
+            },
+          },
+          prettify(p.version),
+        ),
+      ),
+    );
+  }
+
+  paint();
+  return el('div', { class: 'flavor' }, picks.length > 1 ? toggle : null, quote, caption);
+}

src/main.js

@@ -3,12 +3,24 @@ import './styles/layout.css';
 
 import { registerSW } from 'virtual:pwa-register';
 import { el } from './lib/dom.js';
-import { initRouter } from './router.js';
+import { initRouter, rerender } from './router.js';
 import { Nav } from './components/Nav.js';
 import { settings, applyTheme } from './store/settings.js';
 
 applyTheme();
-settings.subscribe(() => applyTheme());
+
+// React to preference changes. The dex feed updates itself in place, but the
+// Pokémon detail page is built once per visit — rebuild it when the selected
+// game changes so its data (flavour text, learnset, matchups, evolution,
+// abilities, locations, era sprites) matches the new game.
+let lastVersionGroup = settings.get().versionGroup;
+settings.subscribe((s) => {
+  applyTheme();
+  if (s.versionGroup !== lastVersionGroup) {
+    lastVersionGroup = s.versionGroup;
+    if ((location.hash || '').startsWith('#/pokemon/')) rerender();
+  }
+});
 window
   .matchMedia('(prefers-color-scheme: dark)')
   .addEventListener('change', () => applyTheme());

src/router.js

@@ -19,6 +19,13 @@ function resolve(hash) {
   return { route: routes[0], match: [] };
 }
 
+let rerenderCurrent = null;
+
+/** Re-run the active route (e.g. after the selected game changed). */
+export function rerender() {
+  if (rerenderCurrent) rerenderCurrent();
+}
+
 export function initRouter(host) {
   let current = null;
 
@@ -56,6 +63,7 @@ export function initRouter(host) {
     window.scrollTo(0, 0);
   }
 
+  rerenderCurrent = render;
   window.addEventListener('hashchange', render);
   render();
 }

src/styles/layout.css

@@ -862,9 +862,53 @@
 .ppanel__flavor {
   font-size: 1rem;
   line-height: 1.6;
-  margin: 0 0 18px;
+  margin: 0 0 6px;
   overflow-wrap: anywhere;
 }
+.flavor {
+  margin-bottom: 18px;
+}
+.flavor__toggle {
+  display: flex;
+  gap: 6px;
+  margin-bottom: 10px;
+}
+.flavor__pill {
+  appearance: none;
+  border: 1.5px solid var(--border);
+  background: var(--surface);
+  color: var(--text-dim);
+  font: inherit;
+  font-size: 0.76rem;
+  font-weight: 600;
+  padding: 5px 13px;
+  border-radius: 999px;
+  cursor: pointer;
+  text-transform: capitalize;
+}
+.flavor__pill.is-active {
+  background: var(--type-main, var(--accent));
+  border-color: var(--type-main, var(--accent));
+  color: #fff;
+}
+.flavor .ppanel__flavor {
+  animation: flavorSlide 0.28s var(--ease-spring);
+}
+@keyframes flavorSlide {
+  from { opacity: 0; transform: translateX(14px); }
+  to { opacity: 1; transform: none; }
+}
+.flavor__cap {
+  display: block;
+  font-size: 0.76rem;
+  color: var(--text-dim);
+  text-transform: capitalize;
+}
+@media (prefers-reduced-motion: reduce) {
+  .flavor .ppanel__flavor {
+    animation: none;
+  }
+}
 .ppanel__sub {
   font-size: 0.8rem;
   text-transform: uppercase;

src/views/PokemonDetail.js

@@ -12,6 +12,7 @@ import { EvolutionChain } from '../components/EvolutionChain.js';
 import { MovesList } from '../components/MovesList.js';
 import { TypeMatchups } from '../components/TypeMatchups.js';
 import { Locations } from '../components/Locations.js';
+import { FlavorText } from '../components/FlavorText.js';
 import { typeHex } from '../lib/type-color.js';
 
 const idFromUrl = (u) => Number(u.replace(/\/$/, '').split('/').pop());
@@ -153,14 +154,6 @@ export async function PokemonDetail(nationalId) {
   syncTrack();
 
   // ---- About panel -----------------------------------------------
-  const wantedVersions = new Set(vg ? vg.versions : []);
-  const englishFlavor = species.flavor_text_entries.filter(
-    (f) => f.language.name === 'en',
-  );
-  const flavor =
-    englishFlavor.find((f) => wantedVersions.has(f.version.name)) ||
-    englishFlavor[englishFlavor.length - 1];
-
   const abilities = pokemon.abilities
     .filter((a) => !a.is_hidden || vgGen >= 5)
     .map((a) => prettify(a.ability.name) + (a.is_hidden ? ' (hidden)' : ''));
@@ -168,9 +161,7 @@ export async function PokemonDetail(nationalId) {
   const aboutPanel = el(
     'div',
     { class: 'ppanel' },
-    flavor
-      ? el('p', { class: 'ppanel__flavor' }, flavor.flavor_text.replace(/\s+/g, ' '))
-      : null,
+    FlavorText(species, vg),
     el(
       'dl',
       { class: 'pfacts' },