feat(dashboard): add milestone view and configurable columns

fixes #16, fixes #19

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

src/gitea_dashboard/collector.py

@@ -23,6 +23,19 @@ class RepoData:
     last_commit_date: str | None  # ISO 8601, ex: "2026-03-10T14:30:00Z"
 
 
+@dataclass
+class MilestoneData:
+    """Donnees agregees d'une milestone avec son repo parent."""
+
+    repo_name: str
+    title: str
+    open_issues: int
+    closed_issues: int
+    progress_pct: int  # Pourcentage de completion (0-100)
+    due_on: str | None  # ISO 8601 ou None
+    state: str  # "open" ou "closed"
+
+
 def _matches_any(name: str, patterns: list[str]) -> bool:
     """Return True if name contains any of the patterns (case-insensitive)."""
     name_lower = name.lower()
@@ -49,10 +62,7 @@ def collect_all(
     repos = client.get_repos()
 
     # Filtrage post-fetch : l'API Gitea ne supporte pas le filtre par nom
-    if include:
-        repos = [r for r in repos if _matches_any(r["name"], include)]
-    if exclude:
-        repos = [r for r in repos if not _matches_any(r["name"], exclude)]
+    repos = _filter_repos(repos, include, exclude)
 
     result: list[RepoData] = []
 
@@ -79,3 +89,58 @@ def collect_all(
         )
 
     return result
+
+
+def _filter_repos(
+    repos: list[dict],
+    include: list[str] | None = None,
+    exclude: list[str] | None = None,
+) -> list[dict]:
+    """Filtre les repos par include/exclude (logique partagee)."""
+    if include:
+        repos = [r for r in repos if _matches_any(r["name"], include)]
+    if exclude:
+        repos = [r for r in repos if not _matches_any(r["name"], exclude)]
+    return repos
+
+
+def collect_milestones(
+    client: GiteaClient,
+    include: list[str] | None = None,
+    exclude: list[str] | None = None,
+) -> list[MilestoneData]:
+    """Collecte les milestones de tous les repos accessibles.
+
+    Reutilise la logique de filtrage de collect_all (include/exclude).
+    Pour chaque repo filtre, appelle client.get_milestones() avec state=all.
+
+    Retourne une liste plate de MilestoneData triee par repo puis milestone.
+    """
+    repos = client.get_repos()
+    repos = _filter_repos(repos, include, exclude)
+
+    result: list[MilestoneData] = []
+
+    for repo in repos:
+        owner = repo["owner"]["login"]
+        name = repo["name"]
+
+        milestones = client.get_milestones(owner, name, state="all")
+
+        for ms in milestones:
+            total = ms["open_issues"] + ms["closed_issues"]
+            pct = round(ms["closed_issues"] / total * 100) if total > 0 else 0
+
+            result.append(
+                MilestoneData(
+                    repo_name=name,
+                    title=ms["title"],
+                    open_issues=ms["open_issues"],
+                    closed_issues=ms["closed_issues"],
+                    progress_pct=pct,
+                    due_on=ms.get("due_on"),
+                    state=ms.get("state", "open"),
+                )
+            )
+
+    return result