Initial artdag-common shared library

Shared components for L1 and L2 servers:
- Jinja2 template system with base template and components
- Middleware for auth and content negotiation
- Pydantic models for requests/responses
- Utility functions for pagination, media, formatting
- Constants for Tailwind/HTMX/Cytoscape CDNs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

artdag_common/templates/components/badge.html

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+{#
+Badge component for status and type indicators.
+
+Usage:
+    {% from "components/badge.html" import badge, status_badge, type_badge %}
+
+    {{ badge("Active", "green") }}
+    {{ status_badge("completed") }}
+    {{ type_badge("EFFECT") }}
+#}
+
+{% macro badge(text, color="gray", class="") %}
+<span class="inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium bg-{{ color }}-600/20 text-{{ color }}-400 {{ class }}">
+    {{ text }}
+</span>
+{% endmacro %}
+
+{% macro status_badge(status, class="") %}
+{% set colors = {
+    "completed": "green",
+    "cached": "blue",
+    "running": "yellow",
+    "pending": "gray",
+    "failed": "red",
+    "active": "green",
+    "inactive": "gray",
+} %}
+{% set color = colors.get(status, "gray") %}
+<span class="inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium bg-{{ color }}-600/20 text-{{ color }}-400 {{ class }}">
+    {% if status == "running" %}
+    <svg class="animate-spin -ml-0.5 mr-1.5 h-3 w-3" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24">
+        <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
+        <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
+    </svg>
+    {% endif %}
+    {{ status | capitalize }}
+</span>
+{% endmacro %}
+
+{% macro type_badge(node_type, class="") %}
+{% set colors = {
+    "SOURCE": "blue",
+    "EFFECT": "green",
+    "OUTPUT": "purple",
+    "ANALYSIS": "amber",
+    "_LIST": "indigo",
+} %}
+{% set color = colors.get(node_type, "gray") %}
+<span class="inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium bg-{{ color }}-600/20 text-{{ color }}-400 {{ class }}">
+    {{ node_type }}
+</span>
+{% endmacro %}
+
+{% macro role_badge(role, class="") %}
+{% set colors = {
+    "input": "blue",
+    "output": "purple",
+    "intermediate": "gray",
+} %}
+{% set color = colors.get(role, "gray") %}
+<span class="inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium bg-{{ color }}-600/20 text-{{ color }}-400 {{ class }}">
+    {{ role | capitalize }}
+</span>
+{% endmacro %}

artdag_common/templates/components/card.html

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+{#
+Card component for displaying information.
+
+Usage:
+    {% include "components/card.html" with title="Status", content="Active", class="col-span-2" %}
+
+Or as a block:
+    {% call card(title="Details") %}
+        <p>Card content here</p>
+    {% endcall %}
+#}
+
+{% macro card(title=None, class="") %}
+<div class="bg-dark-600 rounded-lg p-4 {{ class }}">
+    {% if title %}
+    <h3 class="text-sm font-medium text-gray-400 mb-2">{{ title }}</h3>
+    {% endif %}
+    <div class="text-white">
+        {{ caller() if caller else "" }}
+    </div>
+</div>
+{% endmacro %}
+
+{% macro stat_card(title, value, color="white", class="") %}
+<div class="bg-dark-600 rounded-lg p-4 text-center {{ class }}">
+    <div class="text-2xl font-bold text-{{ color }}-400">{{ value }}</div>
+    <div class="text-sm text-gray-400">{{ title }}</div>
+</div>
+{% endmacro %}
+
+{% macro info_card(title, items, class="") %}
+<div class="bg-dark-600 rounded-lg p-4 {{ class }}">
+    {% if title %}
+    <h3 class="text-sm font-medium text-gray-400 mb-3">{{ title }}</h3>
+    {% endif %}
+    <dl class="space-y-2">
+        {% for label, value in items %}
+        <div class="flex justify-between">
+            <dt class="text-gray-400">{{ label }}</dt>
+            <dd class="text-white font-mono text-sm">{{ value }}</dd>
+        </div>
+        {% endfor %}
+    </dl>
+</div>
+{% endmacro %}

artdag_common/templates/components/dag.html

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+{#
+Cytoscape.js DAG visualization component.
+
+Usage:
+    {% from "components/dag.html" import dag_container, dag_scripts, dag_legend %}
+
+    {# In head block #}
+    {{ dag_scripts() }}
+
+    {# In content #}
+    {{ dag_container(id="plan-dag", height="400px") }}
+    {{ dag_legend() }}
+
+    {# In scripts block #}
+    <script>
+        initDag('plan-dag', {{ nodes | tojson }}, {{ edges | tojson }});
+    </script>
+#}
+
+{% macro dag_scripts() %}
+<script src="{{ CYTOSCAPE_CDN }}"></script>
+<script src="{{ DAGRE_CDN }}"></script>
+<script src="{{ CYTOSCAPE_DAGRE_CDN }}"></script>
+<script>
+// Global Cytoscape instance for WebSocket updates
+window.artdagCy = null;
+
+function initDag(containerId, nodes, edges) {
+    const nodeColors = {{ NODE_COLORS | tojson }};
+
+    window.artdagCy = cytoscape({
+        container: document.getElementById(containerId),
+        elements: {
+            nodes: nodes,
+            edges: edges
+        },
+        style: [
+            {
+                selector: 'node',
+                style: {
+                    'label': 'data(label)',
+                    'text-valign': 'center',
+                    'text-halign': 'center',
+                    'background-color': function(ele) {
+                        return nodeColors[ele.data('nodeType')] || nodeColors['default'];
+                    },
+                    'color': '#fff',
+                    'font-size': '10px',
+                    'width': 80,
+                    'height': 40,
+                    'shape': 'round-rectangle',
+                    'text-wrap': 'wrap',
+                    'text-max-width': '70px',
+                }
+            },
+            {
+                selector: 'node[status="cached"], node[status="completed"]',
+                style: {
+                    'border-width': 3,
+                    'border-color': '#22c55e'
+                }
+            },
+            {
+                selector: 'node[status="running"]',
+                style: {
+                    'border-width': 3,
+                    'border-color': '#eab308',
+                    'border-style': 'dashed'
+                }
+            },
+            {
+                selector: 'node:selected',
+                style: {
+                    'border-width': 3,
+                    'border-color': '#3b82f6'
+                }
+            },
+            {
+                selector: 'edge',
+                style: {
+                    'width': 2,
+                    'line-color': '#6b7280',
+                    'target-arrow-color': '#6b7280',
+                    'target-arrow-shape': 'triangle',
+                    'curve-style': 'bezier'
+                }
+            }
+        ],
+        layout: {
+            name: 'dagre',
+            rankDir: 'TB',
+            nodeSep: 50,
+            rankSep: 80,
+            padding: 20
+        },
+        userZoomingEnabled: true,
+        userPanningEnabled: true,
+        boxSelectionEnabled: false
+    });
+
+    // Click handler for node details
+    window.artdagCy.on('tap', 'node', function(evt) {
+        const node = evt.target;
+        const data = node.data();
+        showNodeDetails(data);
+    });
+
+    return window.artdagCy;
+}
+
+function showNodeDetails(data) {
+    const panel = document.getElementById('node-details');
+    if (!panel) return;
+
+    panel.innerHTML = `
+        <h4 class="font-medium text-white mb-2">${data.label || data.id}</h4>
+        <dl class="space-y-1 text-sm">
+            <div class="flex justify-between">
+                <dt class="text-gray-400">Type</dt>
+                <dd class="text-white">${data.nodeType || 'Unknown'}</dd>
+            </div>
+            <div class="flex justify-between">
+                <dt class="text-gray-400">Status</dt>
+                <dd class="text-white">${data.status || 'pending'}</dd>
+            </div>
+            ${data.cacheId ? `
+            <div class="flex justify-between">
+                <dt class="text-gray-400">Cache ID</dt>
+                <dd class="text-white font-mono text-xs">${data.cacheId.substring(0, 16)}...</dd>
+            </div>
+            ` : ''}
+            ${data.level !== undefined ? `
+            <div class="flex justify-between">
+                <dt class="text-gray-400">Level</dt>
+                <dd class="text-white">${data.level}</dd>
+            </div>
+            ` : ''}
+        </dl>
+    `;
+    panel.classList.remove('hidden');
+}
+
+// Future WebSocket support: update node status in real-time
+function updateNodeStatus(stepId, status, cacheId) {
+    if (!window.artdagCy) return;
+    const node = window.artdagCy.getElementById(stepId);
+    if (node && node.length > 0) {
+        node.data('status', status);
+        if (cacheId) {
+            node.data('cacheId', cacheId);
+        }
+    }
+}
+</script>
+{% endmacro %}
+
+{% macro dag_container(id="dag-container", height="400px", class="") %}
+<div id="{{ id }}" class="w-full bg-dark-700 rounded-lg {{ class }}" style="height: {{ height }};"></div>
+<div id="node-details" class="hidden mt-4 p-4 bg-dark-600 rounded-lg"></div>
+{% endmacro %}
+
+{% macro dag_legend(node_types=None) %}
+{% set types = node_types or ["SOURCE", "EFFECT", "_LIST"] %}
+<div class="flex gap-4 text-sm flex-wrap mt-4">
+    {% for type in types %}
+    <span class="flex items-center gap-2">
+        <span class="w-4 h-4 rounded" style="background-color: {{ NODE_COLORS.get(type, NODE_COLORS.default) }}"></span>
+        {{ type }}
+    </span>
+    {% endfor %}
+    <span class="flex items-center gap-2">
+        <span class="w-4 h-4 rounded border-2 border-green-500 bg-dark-600"></span>
+        Cached
+    </span>
+</div>
+{% endmacro %}

artdag_common/templates/components/media_preview.html

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+{#
+Media preview component for videos, images, and audio.
+
+Usage:
+    {% from "components/media_preview.html" import media_preview, video_player, image_preview, audio_player %}
+
+    {{ media_preview(content_hash, media_type, title="Preview") }}
+    {{ video_player(src="/cache/abc123/mp4", poster="/cache/abc123/thumb") }}
+#}
+
+{% macro media_preview(content_hash, media_type, title=None, class="", show_download=True) %}
+<div class="bg-dark-600 rounded-lg overflow-hidden {{ class }}">
+    {% if title %}
+    <div class="px-4 py-2 border-b border-dark-500">
+        <h3 class="text-sm font-medium text-gray-400">{{ title }}</h3>
+    </div>
+    {% endif %}
+
+    <div class="aspect-video bg-dark-700 flex items-center justify-center">
+        {% if media_type == "video" %}
+        {{ video_player("/cache/" + content_hash + "/mp4") }}
+        {% elif media_type == "image" %}
+        {{ image_preview("/cache/" + content_hash + "/raw") }}
+        {% elif media_type == "audio" %}
+        {{ audio_player("/cache/" + content_hash + "/raw") }}
+        {% else %}
+        <div class="text-gray-400 text-center p-4">
+            <svg class="w-12 h-12 mx-auto mb-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"/>
+            </svg>
+            <p>Preview not available</p>
+        </div>
+        {% endif %}
+    </div>
+
+    {% if show_download %}
+    <div class="px-4 py-2 border-t border-dark-500">
+        <a href="/cache/{{ content_hash }}/raw" download
+           class="text-blue-400 hover:text-blue-300 text-sm">
+            Download original
+        </a>
+    </div>
+    {% endif %}
+</div>
+{% endmacro %}
+
+{% macro video_player(src, poster=None, autoplay=False, muted=True, loop=False, class="") %}
+<video
+    class="w-full h-full object-contain {{ class }}"
+    controls
+    playsinline
+    {% if poster %}poster="{{ poster }}"{% endif %}
+    {% if autoplay %}autoplay{% endif %}
+    {% if muted %}muted{% endif %}
+    {% if loop %}loop{% endif %}
+>
+    <source src="{{ src }}" type="video/mp4">
+    Your browser does not support the video tag.
+</video>
+{% endmacro %}
+
+{% macro image_preview(src, alt="", class="") %}
+<img
+    src="{{ src }}"
+    alt="{{ alt }}"
+    class="w-full h-full object-contain {{ class }}"
+    loading="lazy"
+>
+{% endmacro %}
+
+{% macro audio_player(src, class="") %}
+<div class="w-full px-4 {{ class }}">
+    <audio controls class="w-full">
+        <source src="{{ src }}">
+        Your browser does not support the audio element.
+    </audio>
+</div>
+{% endmacro %}
+
+{% macro thumbnail(content_hash, media_type, size="w-24 h-24", class="") %}
+<div class="bg-dark-700 rounded {{ size }} flex items-center justify-center overflow-hidden {{ class }}">
+    {% if media_type == "image" %}
+    <img src="/cache/{{ content_hash }}/raw" alt="" class="w-full h-full object-cover" loading="lazy">
+    {% elif media_type == "video" %}
+    <svg class="w-8 h-8 text-gray-400" fill="currentColor" viewBox="0 0 24 24">
+        <path d="M8 5v14l11-7z"/>
+    </svg>
+    {% elif media_type == "audio" %}
+    <svg class="w-8 h-8 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 19V6l12-3v13M9 19c0 1.105-1.343 2-3 2s-3-.895-3-2 1.343-2 3-2 3 .895 3 2zm12-3c0 1.105-1.343 2-3 2s-3-.895-3-2 1.343-2 3-2 3 .895 3 2zM9 10l12-3"/>
+    </svg>
+    {% else %}
+    <svg class="w-8 h-8 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"/>
+    </svg>
+    {% endif %}
+</div>
+{% endmacro %}

artdag_common/templates/components/pagination.html

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+{#
+Pagination component with HTMX infinite scroll support.
+
+Usage:
+    {% from "components/pagination.html" import infinite_scroll_trigger, page_links %}
+
+    {# Infinite scroll (HTMX) #}
+    {{ infinite_scroll_trigger(url="/items?page=2", colspan=3, has_more=True) }}
+
+    {# Traditional pagination #}
+    {{ page_links(current_page=1, total_pages=5, base_url="/items") }}
+#}
+
+{% macro infinite_scroll_trigger(url, colspan=1, has_more=True, target=None) %}
+{% if has_more %}
+<tr hx-get="{{ url }}"
+    hx-trigger="revealed"
+    hx-swap="afterend"
+    {% if target %}hx-target="{{ target }}"{% endif %}
+    class="htmx-indicator-row">
+    <td colspan="{{ colspan }}" class="text-center py-4">
+        <span class="text-gray-400 htmx-indicator">
+            <svg class="animate-spin h-5 w-5 inline mr-2" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24">
+                <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
+                <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
+            </svg>
+            Loading more...
+        </span>
+    </td>
+</tr>
+{% endif %}
+{% endmacro %}
+
+{% macro page_links(current_page, total_pages, base_url, class="") %}
+<nav class="flex items-center justify-center space-x-2 {{ class }}">
+    {# Previous button #}
+    {% if current_page > 1 %}
+    <a href="{{ base_url }}?page={{ current_page - 1 }}"
+       class="px-3 py-2 rounded-lg bg-dark-600 text-gray-300 hover:bg-dark-500 transition-colors">
+        &larr; Previous
+    </a>
+    {% else %}
+    <span class="px-3 py-2 rounded-lg bg-dark-700 text-gray-500 cursor-not-allowed">
+        &larr; Previous
+    </span>
+    {% endif %}
+
+    {# Page numbers #}
+    <div class="flex items-center space-x-1">
+        {% for page in range(1, total_pages + 1) %}
+            {% if page == current_page %}
+            <span class="px-3 py-2 rounded-lg bg-blue-600 text-white">{{ page }}</span>
+            {% elif page == 1 or page == total_pages or (page >= current_page - 2 and page <= current_page + 2) %}
+            <a href="{{ base_url }}?page={{ page }}"
+               class="px-3 py-2 rounded-lg bg-dark-600 text-gray-300 hover:bg-dark-500 transition-colors">
+                {{ page }}
+            </a>
+            {% elif page == current_page - 3 or page == current_page + 3 %}
+            <span class="px-2 text-gray-500">...</span>
+            {% endif %}
+        {% endfor %}
+    </div>
+
+    {# Next button #}
+    {% if current_page < total_pages %}
+    <a href="{{ base_url }}?page={{ current_page + 1 }}"
+       class="px-3 py-2 rounded-lg bg-dark-600 text-gray-300 hover:bg-dark-500 transition-colors">
+        Next &rarr;
+    </a>
+    {% else %}
+    <span class="px-3 py-2 rounded-lg bg-dark-700 text-gray-500 cursor-not-allowed">
+        Next &rarr;
+    </span>
+    {% endif %}
+</nav>
+{% endmacro %}
+
+{% macro page_info(page, limit, total) %}
+<div class="text-sm text-gray-400">
+    Showing {{ (page - 1) * limit + 1 }}-{{ [page * limit, total] | min }} of {{ total }}
+</div>
+{% endmacro %}

artdag_common/templates/components/table.html

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+{#
+Table component with dark theme styling.
+
+Usage:
+    {% from "components/table.html" import table, table_row %}
+
+    {% call table(columns=["Name", "Status", "Actions"]) %}
+        {% for item in items %}
+        {{ table_row([item.name, item.status, actions_html]) }}
+        {% endfor %}
+    {% endcall %}
+#}
+
+{% macro table(columns, class="", id="") %}
+<div class="overflow-x-auto {{ class }}" {% if id %}id="{{ id }}"{% endif %}>
+    <table class="w-full text-sm">
+        <thead class="text-gray-400 border-b border-dark-600">
+            <tr>
+                {% for col in columns %}
+                <th class="text-left py-3 px-4 font-medium">{{ col }}</th>
+                {% endfor %}
+            </tr>
+        </thead>
+        <tbody class="divide-y divide-dark-600">
+            {{ caller() }}
+        </tbody>
+    </table>
+</div>
+{% endmacro %}
+
+{% macro table_row(cells, class="", href=None) %}
+<tr class="hover:bg-dark-600/50 transition-colors {{ class }}">
+    {% for cell in cells %}
+    <td class="py-3 px-4">
+        {% if href and loop.first %}
+        <a href="{{ href }}" class="text-blue-400 hover:text-blue-300">{{ cell }}</a>
+        {% else %}
+        {{ cell | safe }}
+        {% endif %}
+    </td>
+    {% endfor %}
+</tr>
+{% endmacro %}
+
+{% macro empty_row(colspan, message="No items found") %}
+<tr>
+    <td colspan="{{ colspan }}" class="py-8 text-center text-gray-400">
+        {{ message }}
+    </td>
+</tr>
+{% endmacro %}