feat(0.31.0): description éditable, pièces jointes d'issues, clic carte fiable

- Tiroir : édition du titre et de la description (PATCH
  forge, journal 'edited', EVENT_TYPES étendu), création
  avec description dépliable.
- Pièces jointes Gitea de bout en bout : client
  list/upload/delete/download (le téléchargement suit
  browser_download_url — l'endpoint asset ne sert que du
  JSON, attrapé au smoke réel), routes proxifiées avec
  CSRF et plafond 25 Mio, UI liste/envoi/suppression ;
  GitHub : supports_attachments=False, message propre.
- Clic carte en délégation d'événement : les écouteurs par
  carte mouraient au premier rafraîchissement live.
- 261 tests verts (7 nouveaux, palier 21) ; cycle réel
  complet validé sur une issue jetable du vrai Gitea
  (création, édition, envoi, téléchargement, suppression).

app/gitea_client.py

@@ -48,6 +48,7 @@ class GiteaClient:
     """
 
     kind = "gitea"
+    supports_attachments = True
     api_suffix = "/api/v1"
     auth_scheme = "token"
 
@@ -503,6 +504,87 @@ class GiteaClient:
         self._cache_clear()
         return r.json()
 
+    async def update_issue(
+        self,
+        owner: str,
+        repo: str,
+        number: int,
+        title: str | None = None,
+        body: str | None = None,
+    ) -> dict:
+        """Edit an issue's title and/or body (0.31.0)."""
+        payload: dict = {}
+        if title is not None:
+            payload["title"] = title
+        if body is not None:
+            payload["body"] = body
+        if not payload:
+            return await self.get_issue(owner, repo, number)
+        r = await self.client.patch(
+            f"/repos/{owner}/{repo}/issues/{number}", json=payload
+        )
+        r.raise_for_status()
+        self._cache_clear()
+        return r.json()
+
+    # ── Pièces jointes des issues (0.31.0) ────────────────
+
+    async def list_issue_assets(
+        self, owner: str, repo: str, number: int
+    ) -> list[dict]:
+        """Attachments of an issue (Gitea assets)."""
+        return await self._get(
+            f"/repos/{owner}/{repo}/issues/{number}/assets"
+        )
+
+    async def upload_issue_asset(
+        self,
+        owner: str,
+        repo: str,
+        number: int,
+        filename: str,
+        content: bytes,
+        content_type: str = "application/octet-stream",
+    ) -> dict:
+        """Attach a file to an issue; returns the asset record."""
+        r = await self.client.post(
+            f"/repos/{owner}/{repo}/issues/{number}/assets",
+            files={"attachment": (filename, content, content_type)},
+        )
+        r.raise_for_status()
+        return r.json()
+
+    async def delete_issue_asset(
+        self, owner: str, repo: str, number: int, asset_id: int
+    ) -> None:
+        r = await self.client.delete(
+            f"/repos/{owner}/{repo}/issues/{number}/assets/{asset_id}"
+        )
+        r.raise_for_status()
+
+    async def download_issue_asset(
+        self, owner: str, repo: str, number: int, asset_id: int
+    ) -> tuple[bytes, str]:
+        """(content, content_type) of one attachment.
+
+        Gitea nuance (vérifiée en réel sur 1.27.3): GET on the
+        asset endpoint returns its JSON record, NOT the bytes —
+        the file itself lives at `browser_download_url`
+        (/attachments/<uuid>), fetched here with the connection's
+        token so private repos work too.
+        """
+        record = await self._get(
+            f"/repos/{owner}/{repo}/issues/{number}/assets/{asset_id}"
+        )
+        url = record.get("browser_download_url") if isinstance(record, dict) else None
+        if not url:
+            raise ValueError("La forge ne fournit pas d'URL de téléchargement")
+        r = await self.client.get(url)
+        r.raise_for_status()
+        return r.content, r.headers.get(
+            "content-type", "application/octet-stream"
+        )
+
     async def set_issue_state(
         self, owner: str, repo: str, issue_number: int, state: str
     ) -> dict: