feat(ui): migrate to Tailwind (compiled) + Flowbite JS; new navbar/layout; Docker CSS build

- Add multi-stage CSS build that compiles Tailwind into app/static/tw.css
- Add Tailwind config with dark tokens (bg/nav/card) and purge globs
- Add assets/input.css (@tailwind base/components/utilities + small utilities)
- Replace Tailwind CDN + REMOVE Flowbite CSS (keep Flowbite JS only)
- New base_tailwind.html (top navbar, responsive container, {%- block scripts -%})
- Port pages to Tailwind look/feel with wider content column:
  - index: single-column form + recent results, fullscreen spinner overlay, copy-UUID
  - result: sticky jump list, Tailwind tables/badges, Suspicious Scripts/Forms sections
  - viewer: Monaco-based code viewer in Tailwind card, actions (copy/wrap/raw)
  - ssl_tls macro: rewritten with Tailwind (details/summary for raw JSON)
- Dockerfile: add css-builder stage and copy built tw.css into /app/app/static
- Remove Flowbite stylesheet to avoid overrides; Flowbite JS loaded with defer

BREAKING CHANGE:
Legacy CSS classes/components (.card, .badge, etc.) are replaced by Tailwind utilities.
All templates now expect tw.css to be served from /static.

Dockerfile

@@ -1,3 +1,24 @@
+# --- Stage 1: CSS builder (no npm) ---
+FROM alpine:3.20 AS css-builder
+WORKDIR /css
+RUN apk add --no-cache curl
+
+# Download Tailwind standalone CLI
+# (Update version if desired; linux-x64 works on Alpine)
+RUN curl -sL https://github.com/tailwindlabs/tailwindcss/releases/download/v3.4.10/tailwindcss-linux-x64 \
+  -o /usr/local/bin/tailwindcss && chmod +x /usr/local/bin/tailwindcss
+
+# Config + sources
+COPY tailwind/tailwind.config.js ./
+COPY assets ./assets
+COPY app/templates ./app/templates
+COPY app/static ./app/static
+
+# Build Tailwind CSS
+RUN tailwindcss -i ./assets/input.css -o ./tw.css --minify
+
+# --- Stage 2: Playwright python image with requirements.
+
 # Use the official Playwright image with browsers preinstalled
 FROM mcr.microsoft.com/playwright/python:v1.45.0-jammy
 
@@ -19,6 +40,9 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Copy application code (the double app is needed because the app folder needs to be inside the app folder)
 COPY app/ /app/app/
 
+# Bring in the compiled CSS from Stage 1
+COPY --from=css-builder /css/tw.css /app/app/static/tw.css
+
 COPY entrypoint.sh ./entrypoint.sh
 RUN chmod +x /app/entrypoint.sh