feat(display): add Rich dashboard rendering (fixes #3)

Render repos in a Rich table with [F]ork/[A]rchive/[M]irror indicators,
color-coded issue counts, relative release dates, and a milestones section.
Handles empty repo lists gracefully.

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

tests/test_display.py

@@ -0,0 +1,216 @@
+"""Tests for Rich dashboard display."""
+
+from io import StringIO
+
+from rich.console import Console
+
+from gitea_dashboard.collector import RepoData
+from gitea_dashboard.display import render_dashboard
+
+
+def _make_console():
+    """Create a console that captures output for testing.
+
+    highlight=False desactive le highlighting automatique de Rich
+    qui fragmente les nombres et noms avec des codes ANSI.
+    """
+    buf = StringIO()
+    return Console(file=buf, force_terminal=True, width=120, highlight=False), buf
+
+
+def _make_repo(
+    name="my-repo",
+    full_name="admin/my-repo",
+    description="A repo",
+    open_issues=3,
+    is_fork=False,
+    is_archived=False,
+    is_mirror=False,
+    latest_release=None,
+    milestones=None,
+):
+    """Build a RepoData for testing."""
+    return RepoData(
+        name=name,
+        full_name=full_name,
+        description=description,
+        open_issues=open_issues,
+        is_fork=is_fork,
+        is_archived=is_archived,
+        is_mirror=is_mirror,
+        latest_release=latest_release,
+        milestones=milestones if milestones is not None else [],
+    )
+
+
+class TestRenderDashboardTable:
+    """Test the main repos table rendering."""
+
+    def test_basic_repo_displayed(self):
+        """Repo name and issues count appear in output."""
+        console, buf = _make_console()
+        repos = [
+            _make_repo(
+                name="mon-projet",
+                open_issues=3,
+                latest_release={"tag_name": "v1.2.0", "published_at": "2026-03-08T10:00:00Z"},
+            ),
+        ]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        assert "mon-projet" in output
+        assert "v1.2.0" in output
+
+    def test_repo_without_release_shows_dash(self):
+        """Repo with no release shows a dash character."""
+        console, buf = _make_console()
+        repos = [_make_repo(name="no-release", latest_release=None)]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        assert "no-release" in output
+        # The dash character for "no release"
+        assert "\u2014" in output or "—" in output
+
+    def test_fork_indicator(self):
+        """Fork repos show [F] indicator."""
+        console, buf = _make_console()
+        repos = [_make_repo(name="forked-repo", is_fork=True)]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        assert "forked-repo" in output
+        assert "[F]" in output
+
+    def test_archive_indicator(self):
+        """Archived repos show [A] indicator."""
+        console, buf = _make_console()
+        repos = [_make_repo(name="old-repo", is_archived=True)]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        assert "[A]" in output
+
+    def test_mirror_indicator(self):
+        """Mirror repos show [M] indicator."""
+        console, buf = _make_console()
+        repos = [_make_repo(name="mirror-repo", is_mirror=True)]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        assert "[M]" in output
+
+    def test_multiple_indicators(self):
+        """Repo with multiple flags shows all indicators."""
+        console, buf = _make_console()
+        repos = [_make_repo(name="special", is_fork=True, is_archived=True)]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        assert "[F]" in output
+        assert "[A]" in output
+
+    def test_issues_zero(self):
+        """Repos with 0 issues display 0."""
+        console, buf = _make_console()
+        repos = [_make_repo(name="clean-repo", open_issues=0)]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        assert "0" in output
+
+    def test_multiple_repos(self):
+        """Multiple repos all appear in the output."""
+        console, buf = _make_console()
+        repos = [
+            _make_repo(name="repo-alpha", open_issues=1),
+            _make_repo(name="repo-beta", open_issues=5),
+        ]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        assert "repo-alpha" in output
+        assert "repo-beta" in output
+
+
+class TestRenderDashboardMilestones:
+    """Test the milestones section rendering."""
+
+    def test_milestones_displayed(self):
+        """Repos with milestones show milestone info."""
+        console, buf = _make_console()
+        repos = [
+            _make_repo(
+                name="mon-projet",
+                milestones=[
+                    {
+                        "title": "v2.0",
+                        "open_issues": 2,
+                        "closed_issues": 3,
+                        "due_on": "2026-04-01T00:00:00Z",
+                    },
+                ],
+            ),
+        ]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        assert "v2.0" in output
+        assert "3/5" in output  # closed/total
+        assert "60%" in output
+
+    def test_milestone_without_due_date(self):
+        """Milestone without due_on omits the deadline."""
+        console, buf = _make_console()
+        repos = [
+            _make_repo(
+                name="projet",
+                milestones=[
+                    {
+                        "title": "backlog",
+                        "open_issues": 5,
+                        "closed_issues": 1,
+                        "due_on": None,
+                    },
+                ],
+            ),
+        ]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        assert "backlog" in output
+        assert "1/6" in output
+
+    def test_no_milestones_section_when_none(self):
+        """When no repos have milestones, milestone section is absent."""
+        console, buf = _make_console()
+        repos = [_make_repo(name="simple", milestones=[])]
+
+        render_dashboard(repos, console=console)
+        output = buf.getvalue()
+
+        assert "Milestones" not in output
+
+
+class TestRenderDashboardEmpty:
+    """Test empty repo list handling."""
+
+    def test_empty_list_shows_message(self):
+        """Empty repo list shows informative message."""
+        console, buf = _make_console()
+
+        render_dashboard([], console=console)
+        output = buf.getvalue()
+
+        assert "Aucun repo" in output