brief sprint C1: relocate Post + Line from dashboard → billboard (no behavior change) — TDD

The Post/Line models always read more like billboard tenants than dashboard ones (1st-person personal vs. 2nd-person provenance feed); the upcoming Brief model needs them in the billboard namespace as the canonical surface they FK into. C1 is a pure relocation w. zero new behavior: 789 ITs + 20 sky/Post FTs green against the moved code.

- billboard.models adds Post (owner + shared_with) + Line (text + post FK), schema mirroring the legacy dashboard models 1:1; Post.get_absolute_url now reverses to `billboard:view_post`.
- billboard.forms adds LineForm + ExistingPostLineForm (moved from dashboard.forms; dashboard/forms.py removed).
- billboard.views absorbs new_post / view_post / share_post / my_posts (templates rendered from apps/billboard/post.html + my_posts.html).
- billboard.urls adds the namespaced routes: /billboard/new-post, /billboard/post/<uuid>/, /billboard/post/<uuid>/share-post, /billboard/users/<uuid>/. dashboard.urls drops the corresponding entries.
- _applet-my-posts + _applet-new-post URL refs now use the billboard: namespace; templates/apps/dashboard/{post,my_posts}.html removed.
- api/serializers + api/views + api/tests/integrated/test_views imports flip dashboard.models → billboard.models (PostSerializer / PostDetailAPI / PostLinesAPI / PostsAPI all retain identifiers — the model rename to Brief lands in C2).
- dashboard/tests/integrated/test_{models,views,forms} + dashboard/tests/unit/test_{models,forms} swap imports; test_views URL strings flip /dashboard/post/ → /billboard/post/, /dashboard/new_post → /billboard/new-post, /dashboard/users/ → /billboard/users/, share_post → share-post (path) / billboard:share_post (reverser). Tests stay in dashboard.tests/ for now — relocation TBD.
- functional_tests/my_posts_page.py URL string flips to /billboard/users/.
- Auto-generated migrations: billboard/0001_initial (CreateModel Post + Line), dashboard/0003_remove_post_* (drops legacy Post + Line), drama/0004_alter_gameevent_verb (incidental — choices field caught up).

This commit drops the dashboard Post/Line tables w/o data preservation; user has confirmed staging-side wipe is acceptable. C2 introduces the Brief model + read-tracking + slide-down banner unification. C3 hooks Note-unlock + share-post-invite + magic-link / invalid-link `messages` calls into the new Brief / banner pipeline.

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Sonnet 4.6 <noreply@anthropic.com>

src/templates/apps/billboard/post.html

@@ -0,0 +1,57 @@
+{% extends "core/base.html" %}
+{% load lyric_extras %}
+
+{% block title_text %}Dashpost{% endblock title_text %}
+{% block header_text %}<span>Dash</span>post{% endblock header_text %}
+
+
+{% block extra_header %}
+    {% url "billboard:view_post" post.id as form_action %}
+    {% include "apps/dashboard/_partials/_form.html" with form=form form_action=form_action %}
+{% endblock extra_header %}
+
+{% block content %}
+    <div class="row justify-content-center">
+        <div class="col-lg-6">
+            <small>Post created by: <span id="id_post_owner">{{ post.owner|display_name }}</span></small>
+            <table id="id_post_table" class="table">
+                {% for line in post.lines.all %}
+                    <tr><td>{{ forloop.counter }}. {{ line.text }}</td></tr>
+                {% endfor %}
+            </table>
+        </div>
+    </div>
+
+    <div class="row justify-content-center">
+        <div class="col-lg-6">
+
+            <form method="POST" action="{% url "billboard:share_post" post.id %}">
+                {% csrf_token %}
+                <input
+                    id="id_recipient"
+                    name="recipient"
+                    class="form-control form-control-lg{% if form.errors.recipient %} is-invalid{% endif %}"
+                    placeholder="friend@example.com"
+                    aria-describedby="id_recipient_feedback"
+                    required
+                />
+                {% if form.errors.recipient %}
+                    <div id="id_recipient_feedback" class="invalid-feedback">
+                        {{ form.errors.recipient.0 }}
+                    </div>
+                {% endif %}
+
+                <button type="submit" class="btn btn-primary">Share</button>
+            </form>
+            <small>Post shared with:
+                {% for user in post.shared_with.all %}
+                    <span class="post-recipient">{{ user|display_name }}</span>
+                {% endfor %}
+            </small>
+        </div>
+    </div>
+{% endblock content %}
+
+{% block scripts %}
+    {% include "apps/dashboard/_partials/_scripts.html" %}
+{% endblock scripts %}