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>

docker-compose.yml

@@ -1,23 +1,33 @@
+x-env: &env
+  PORT: "${PORT:-3000}"
+  HOST: "${HOST:-0.0.0.0}"
+  JWT_SECRET: "${JWT_SECRET}"
+  JWT_EXPIRY: "${JWT_EXPIRY:-7d}"
+  DB_PATH: "${DB_PATH:-./data/nanodrop.db}"
+  UPLOAD_DIR: "${UPLOAD_DIR:-./data/uploads}"
+  LOG_FILE: "${LOG_FILE:-./data/nanodrop.log}"
+  MAX_FILE_SIZE: "${MAX_FILE_SIZE:-104857600}"
+  BASE_URL: "${BASE_URL:-http://localhost:3000}"
+  COOKIE_SECURE: "${COOKIE_SECURE:-false}"
+  TRUST_PROXY: "${TRUST_PROXY:-false}"
+
 services:
   nanodrop:
     build: .
     ports:
       - "${PORT:-3000}:3000"
-    environment:
-      PORT: "${PORT:-3000}"
-      HOST: "${HOST:-0.0.0.0}"
-      JWT_SECRET: "${JWT_SECRET}"
-      JWT_EXPIRY: "${JWT_EXPIRY:-7d}"
-      DB_PATH: "${DB_PATH:-./data/nanodrop.db}"
-      UPLOAD_DIR: "${UPLOAD_DIR:-./data/uploads}"
-      LOG_FILE: "${LOG_FILE:-./data/nanodrop.log}"
-      MAX_FILE_SIZE: "${MAX_FILE_SIZE:-104857600}"
-      BASE_URL: "${BASE_URL:-http://localhost:3000}"
-      COOKIE_SECURE: "${COOKIE_SECURE:-false}"
-      TRUST_PROXY: "${TRUST_PROXY:-false}"
+    environment: { <<: *env }
     volumes:
       - nanodrop-data:/app/data
     restart: unless-stopped
 
+  register-user:
+    build: .
+    profiles: [tools]
+    entrypoint: ["node", "--import", "tsx", "src/cli/register-user.ts"]
+    environment: { <<: *env }
+    volumes:
+      - nanodrop-data:/app/data
+
 volumes:
   nanodrop-data: