feat(about): credit Cinny logo + upstream project in Settings → About

The current Lotus Chat icon overlaps the Cinny project logo with the Lotus
Guild emblem, but the in-app Credits list gave Cinny no attribution at all.
Add two credit entries (matching the wording already in README.md):
- the logo as a CC-BY 4.0 derivative of the Cinny logo by Ajay Bura and
  contributors (modified logo © Lotus Guild, also CC-BY 4.0);
- Lotus Chat as a fork of Cinny used under AGPL-3.0.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/features/settings/about/About.tsx

@@ -255,6 +255,56 @@ export function About({ requestClose }: AboutProps) {
                       paddingLeft: config.space.S400,
                     }}
                   >
+                    <li>
+                      <Text size="T300">
+                        The Lotus Chat logo is a derivative work based on the original{' '}
+                        <a
+                          href="https://github.com/cinnyapp/cinny"
+                          rel="noreferrer noopener"
+                          target="_blank"
+                        >
+                          Cinny
+                        </a>{' '}
+                        logo by{' '}
+                        <a
+                          href="https://github.com/ajbura"
+                          rel="noreferrer noopener"
+                          target="_blank"
+                        >
+                          Ajay Bura
+                        </a>{' '}
+                        and contributors, used under the terms of{' '}
+                        <a
+                          href="https://creativecommons.org/licenses/by/4.0/"
+                          rel="noreferrer noopener"
+                          target="_blank"
+                        >
+                          CC-BY 4.0
+                        </a>
+                        . The modified logo is © Lotus Guild, also under CC-BY 4.0.
+                      </Text>
+                    </li>
+                    <li>
+                      <Text size="T300">
+                        Lotus Chat is a fork of{' '}
+                        <a
+                          href="https://github.com/cinnyapp/cinny"
+                          rel="noreferrer noopener"
+                          target="_blank"
+                        >
+                          Cinny
+                        </a>{' '}
+                        by Ajay Bura and contributors, used under the terms of{' '}
+                        <a
+                          href="https://www.gnu.org/licenses/agpl-3.0.html"
+                          rel="noreferrer noopener"
+                          target="_blank"
+                        >
+                          AGPL-3.0
+                        </a>
+                        .
+                      </Text>
+                    </li>
                     <li>
                       <Text size="T300">
                         The{' '}