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>

src/gitea_dashboard/display.py

@@ -0,0 +1,128 @@
+"""Formatage et affichage Rich du dashboard Gitea."""
+
+from __future__ import annotations
+
+from datetime import datetime, timezone
+
+from rich.console import Console
+from rich.table import Table
+
+from gitea_dashboard.collector import RepoData
+
+
+def _format_repo_name(repo: RepoData) -> str:
+    """Formate le nom du repo avec les indicateurs visuels."""
+    indicators = []
+    if repo.is_fork:
+        indicators.append("[F]")
+    if repo.is_archived:
+        indicators.append("[A]")
+    if repo.is_mirror:
+        indicators.append("[M]")
+
+    if indicators:
+        return f"{repo.name} {' '.join(indicators)}"
+    return repo.name
+
+
+def _format_relative_date(iso_date: str) -> str:
+    """Convertit une date ISO en date relative lisible."""
+    try:
+        dt = datetime.fromisoformat(iso_date.replace("Z", "+00:00"))
+    except (ValueError, AttributeError):
+        return ""
+
+    now = datetime.now(timezone.utc)
+    delta = now - dt
+
+    days = delta.days
+    if days < 0:
+        return "dans le futur"
+    if days == 0:
+        return "aujourd'hui"
+    if days == 1:
+        return "il y a 1j"
+    if days < 30:
+        return f"il y a {days}j"
+    months = days // 30
+    if months < 12:
+        return f"il y a {months}m"
+    years = days // 365
+    return f"il y a {years}a"
+
+
+def _format_release(release: dict | None) -> str:
+    """Formate la release pour l'affichage."""
+    if release is None:
+        return "\u2014"
+
+    tag = release.get("tag_name", "")
+    published = release.get("published_at", "")
+
+    if published:
+        relative = _format_relative_date(published)
+        if relative:
+            return f"{tag} ({relative})"
+
+    return tag
+
+
+def render_dashboard(repos: list[RepoData], console: Console | None = None) -> None:
+    """Affiche le dashboard complet dans le terminal.
+
+    - Tableau principal : nom repo, indicateurs (fork/archive/mirror),
+      issues ouvertes, derniere release (tag + date relative)
+    - Section milestones : par repo ayant des milestones,
+      nom, progression (closed/total), date echeance
+
+    Le parametre console permet l'injection pour les tests.
+    """
+    if console is None:
+        console = Console()
+
+    if not repos:
+        console.print("Aucun repo trouve.")
+        return
+
+    # Tableau principal
+    table = Table(title="Gitea Dashboard")
+    table.add_column("Repo", style="bold")
+    table.add_column("Issues", justify="right")
+    table.add_column("Release")
+
+    for repo in repos:
+        name = _format_repo_name(repo)
+        issues_str = str(repo.open_issues)
+        issues_style = "red" if repo.open_issues > 0 else "green"
+        release_str = _format_release(repo.latest_release)
+
+        table.add_row(name, f"[{issues_style}]{issues_str}[/{issues_style}]", release_str)
+
+    console.print(table)
+
+    # Section milestones — uniquement si au moins un repo en a
+    repos_with_milestones = [r for r in repos if r.milestones]
+
+    if repos_with_milestones:
+        console.print()
+        console.print("[bold]Milestones[/bold]")
+
+        for repo in repos_with_milestones:
+            for ms in repo.milestones:
+                title = ms["title"]
+                closed = ms["closed_issues"]
+                total = ms["open_issues"] + ms["closed_issues"]
+                pct = round(closed / total * 100) if total > 0 else 0
+
+                line = f"  {repo.name} / {title} : {closed}/{total} ({pct}%)"
+
+                due_on = ms.get("due_on")
+                if due_on:
+                    # Extraire juste la date (YYYY-MM-DD)
+                    try:
+                        dt = datetime.fromisoformat(due_on.replace("Z", "+00:00"))
+                        line += f" \u2014 echeance {dt.strftime('%Y-%m-%d')}"
+                    except (ValueError, AttributeError):
+                        pass
+
+                console.print(line)