Fix four bugs and add logo/branding polish

- docker-compose: add register-user service (profiles: [tools]) with YAML anchor to avoid env duplication
- src/index.ts: show localhost instead of 0.0.0.0 in startup message
- file-view: render <img> inline for image/* MIME types
- file-list: add Copy link button per row (requires baseUrl param)
- layout: add hideLogo option; file view page hides the logo
- style.css: remove uppercase from .logo (Nanodrop not NANODROP), add button.copy-link styles, add .file-view img styles, widen last td

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/views/file-view.ts

@@ -11,7 +11,9 @@ export function fileViewPage(file: FileRow): string {
     </div>`;
 
   let media = '';
-  if (file.mime_type.startsWith('video/')) {
+  if (file.mime_type.startsWith('image/')) {
+    media = `<img src="${rawUrl}" alt="${safeName}">`;
+  } else if (file.mime_type.startsWith('video/')) {
     media = `<video controls src="${rawUrl}" preload="metadata"></video>`;
   } else if (file.mime_type.startsWith('audio/')) {
     media = `<audio controls src="${rawUrl}" preload="metadata"></audio>`;
@@ -23,5 +25,5 @@ export function fileViewPage(file: FileRow): string {
       ${media}
       ${actions}
     </div>
-  `);
+  `, { hideLogo: true });
 }