fix(themes): show store thumbnails in 16:9 (#1018)

* fix(themes): show store thumbnails in 16:9

Thumbnails are now 16:9 WebP. Render the store-row preview at 200x112
(16:9) so the screenshot isn't cropped in the grid; the lightbox already
shows it full size, now larger and crisper from the 1280x720 source.

* docs(themes): note the 16:9 thumbnail PR in the Theme Store entry

CHANGELOG.md

@@ -56,7 +56,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Themes — community Theme Store
 
-**By [@Psychotoxical](https://github.com/Psychotoxical), PR [#1009](https://github.com/Psychotoxical/psysonic/pull/1009), [#1011](https://github.com/Psychotoxical/psysonic/pull/1011), [#1012](https://github.com/Psychotoxical/psysonic/pull/1012), [#1013](https://github.com/Psychotoxical/psysonic/pull/1013), [#1014](https://github.com/Psychotoxical/psysonic/pull/1014), [#1015](https://github.com/Psychotoxical/psysonic/pull/1015), [#1016](https://github.com/Psychotoxical/psysonic/pull/1016)**
+**By [@Psychotoxical](https://github.com/Psychotoxical), PR [#1009](https://github.com/Psychotoxical/psysonic/pull/1009), [#1011](https://github.com/Psychotoxical/psysonic/pull/1011), [#1012](https://github.com/Psychotoxical/psysonic/pull/1012), [#1013](https://github.com/Psychotoxical/psysonic/pull/1013), [#1014](https://github.com/Psychotoxical/psysonic/pull/1014), [#1015](https://github.com/Psychotoxical/psysonic/pull/1015), [#1016](https://github.com/Psychotoxical/psysonic/pull/1016), [#1018](https://github.com/Psychotoxical/psysonic/pull/1018)**
 
 * New **Settings → Themes** tab: pick a theme, set the day/night scheduler, and browse a built-in **Theme Store** to install, update and uninstall community themes — with search, a dark/light filter, and full-size thumbnail previews.
 * The app now bundles six core themes (Catppuccin Mocha & Latte, Kanagawa Wave, Stark HUD, and the colour-blind-safe Vision Dark / Vision Navy); every other palette installs on demand from the [psysonic-themes](https://github.com/Psysonic/psysonic-themes) repo. Installed themes are saved locally and apply instantly at startup, even offline.

src/components/settings/ThemeStoreSection.tsx

@@ -278,11 +278,11 @@ export function ThemeStoreSection() {
                     alt=""
                     loading="lazy"
                     width={200}
-                    height={125}
+                    height={112}
                     // Offline / missing thumbnail: hide the broken-image glyph; the
                     // image's own neutral background stands in as a placeholder.
                     onError={e => { e.currentTarget.style.opacity = '0'; }}
-                    style={{ width: 200, height: 125, objectFit: 'cover', borderRadius: 6, background: 'var(--bg-deep)' }}
+                    style={{ width: 200, height: 112, objectFit: 'cover', borderRadius: 6, background: 'var(--bg-deep)' }}
                   />
                 </button>
                 <div style={{ flex: 1, minWidth: 0, display: 'flex', flexDirection: 'column', gap: 2 }}>

src/config/settingsCredits.ts

@@ -357,7 +357,7 @@ const CONTRIBUTOR_ENTRIES = [
       'Performance Probe: Monitor/Toggles redesign, live CPU/RSS/thread metrics, overlay pins and sparklines, macOS snapshots (PR #890)',
       'Performance Probe: opt-in thread-group CPU poll toggle and includeThreadGroups IPC fix (PR #891)',
       'Queue: switchable display mode — Queue (upcoming only) vs Playlist (full list), with header toggle and settings entry (PR #922)',
-      'Community Theme Store: semantic-token refactor, dedicated Themes tab with day/night scheduler, install/update/uninstall, local .zip import, and free-form community themes (safety floor + state-reactive styling); 80+ palettes moved to an on-demand CDN repo (PR #1009, #1011, #1012, #1013, #1014, #1015, #1016)',
+      'Community Theme Store: semantic-token refactor, dedicated Themes tab with day/night scheduler, install/update/uninstall, local .zip import, and free-form community themes (safety floor + state-reactive styling); 80+ palettes moved to an on-demand CDN repo (PR #1009, #1011, #1012, #1013, #1014, #1015, #1016, #1018)',
     ],
   },
   {