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-list.ts

@@ -1,21 +1,25 @@
 import { layout, escHtml } from './layout.ts';
 import type { FileRow } from '../db/files.ts';
 
-export function fileListPage(files: FileRow[]): string {
+export function fileListPage(files: FileRow[], baseUrl: string): string {
   const rows = files.length === 0
     ? '<tr><td colspan="5">No files yet. <a href="/upload">Upload one.</a></td></tr>'
-    : files.map((f) => `
+    : files.map((f) => {
+        const shareUrl = `${baseUrl}/f/${escHtml(f.id)}`;
+        return `
         <tr>
           <td><a href="/f/${escHtml(f.id)}">${escHtml(f.original_name)}</a></td>
           <td>${escHtml(f.mime_type)}</td>
           <td>${formatBytes(f.size)}</td>
           <td>${escHtml(f.created_at)}</td>
           <td>
+            <button class="copy-link" onclick="navigator.clipboard.writeText('${shareUrl}')">Copy link</button>
             <form method="POST" action="/files/${escHtml(f.id)}/delete" style="display:inline">
               <button type="submit" class="danger">Delete</button>
             </form>
           </td>
-        </tr>`).join('');
+        </tr>`;
+      }).join('');
 
   return layout('My files', `
     <h1>My files</h1>