[POLISH] Docker setup fix + UI polish + project completion

- Fix Docker: add php.ini, correct env var names (DB_NAME/DB_USER/DB_PASS),
  add 002_email_log.sql to initdb, add Authorization header passthrough,
  add uploads volume, install opcache, create .dockerignore
- UI polish: page fade-in transitions, skeleton loader CSS, staggered card
  animations, mobile sidebar backdrop overlay, keyboard focus-visible styles,
  button loading state, tooltip system, alert banners, tab component,
  custom scrollbar, print styles, clickable table rows
- Add setButtonLoading() and _toggleSidebar() helpers to common.js
- Update CLAUDE.md to reflect 100% project completion

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

docker/php.ini

@@ -0,0 +1,30 @@
+[PHP]
+; ── Upload Limits ──────────────────────────────────────────────────────────
+upload_max_filesize = 20M
+post_max_size = 25M
+
+; ── Memory & Execution ─────────────────────────────────────────────────────
+memory_limit = 256M
+max_execution_time = 300
+max_input_time = 60
+
+; ── Error Handling ─────────────────────────────────────────────────────────
+display_errors = Off
+display_startup_errors = Off
+log_errors = On
+error_log = /var/log/php-errors.log
+error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT
+
+; ── Timezone ───────────────────────────────────────────────────────────────
+date.timezone = Europe/Rome
+
+; ── Session ────────────────────────────────────────────────────────────────
+session.cookie_httponly = 1
+session.cookie_secure = 1
+session.use_strict_mode = 1
+
+; ── OPcache ────────────────────────────────────────────────────────────────
+opcache.enable = 1
+opcache.memory_consumption = 128
+opcache.max_accelerated_files = 4000
+opcache.validate_timestamps = 0