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>

tests/integration/pages.test.ts

@@ -133,6 +133,54 @@ describe('GET /f/:id and GET /f/:id/raw', () => {
   });
 });
 
+describe('GET /f/:id — image inline', () => {
+  let ctx: TestContext;
+  let fileId: string;
+
+  beforeEach(async () => {
+    ctx = await setup();
+    const token = await loginAs(ctx.app, 'alice', 'secret');
+    const uploadRes = await ctx.app.inject({
+      method: 'POST',
+      url: '/upload',
+      cookies: { token },
+      ...buildMultipart({ file: { filename: 'photo.png', contentType: 'image/png', data: Buffer.from('fakepng') } }),
+    });
+    const match = uploadRes.body.match(/\/f\/([^/"]+)/);
+    fileId = match?.[1] ?? '';
+  });
+  afterEach(async () => { await ctx.app.close(); ctx.cleanup(); });
+
+  it('shows <img> tag for image files', async () => {
+    const res = await ctx.app.inject({ method: 'GET', url: `/f/${fileId}` });
+    expect(res.statusCode).toBe(200);
+    expect(res.body).toContain('<img');
+  });
+});
+
+describe('GET /files — copy link', () => {
+  let ctx: TestContext;
+  let token: string;
+
+  beforeEach(async () => {
+    ctx = await setup();
+    token = await loginAs(ctx.app, 'alice', 'secret');
+    await ctx.app.inject({
+      method: 'POST',
+      url: '/upload',
+      cookies: { token },
+      ...buildMultipart({ file: { filename: 'test.txt', contentType: 'text/plain', data: Buffer.from('hi') } }),
+    });
+  });
+  afterEach(async () => { await ctx.app.close(); ctx.cleanup(); });
+
+  it('shows Copy link button for each file', async () => {
+    const res = await ctx.app.inject({ method: 'GET', url: '/files', cookies: { token } });
+    expect(res.statusCode).toBe(200);
+    expect(res.body).toContain('Copy link');
+  });
+});
+
 describe('POST /files/:id/delete', () => {
   let ctx: TestContext;
   let token: string;