feat: version display + issues board

Version: CalVer + git hash shown in top-right corner of main page.
Built via Docker ARG BUILD_VERSION at build time. Served via /api-version.

Issues Board: shared notepad window for tracking issues with plugin,
overlord, nav files, macros. Stored in openissues.json on server.
- GET/POST/DELETE /issues endpoints
- Draggable window matching Chat/Radar pattern
- Category tags (plugin, overlord, nav, macro, other) with colors
- Add/resolve issues through the UI

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

main.py

@@ -10,6 +10,7 @@ from datetime import datetime, timedelta, timezone
 import json
 import logging
 import os
+import uuid
 import sys
 import time
 from typing import Dict, List, Any
@@ -1326,6 +1327,64 @@ async def get_recent_activity():
         raise HTTPException(status_code=500, detail="Internal server error")
 
 
+# ─── Version endpoint ────────────────────────────────────────────
+@app.get("/api-version")
+async def get_version():
+    """Return the application version (CalVer + git hash, set at build time)."""
+    return {"version": os.environ.get("APP_VERSION", "dev")}
+
+
+# ─── Issues board endpoints ──────────────────────────────────────
+ISSUES_FILE = Path("openissues.json")
+
+
+def _load_issues():
+    if ISSUES_FILE.exists():
+        try:
+            return json.loads(ISSUES_FILE.read_text())
+        except (json.JSONDecodeError, IOError):
+            pass
+    return []
+
+
+def _save_issues(issues):
+    ISSUES_FILE.write_text(json.dumps(issues, indent=2))
+
+
+@app.get("/issues")
+async def get_issues():
+    """Return all open issues."""
+    return {"issues": _load_issues()}
+
+
+@app.post("/issues")
+async def add_issue(issue: dict):
+    """Add a new issue."""
+    issues = _load_issues()
+    new_issue = {
+        "id": uuid.uuid4().hex[:8],
+        "title": issue.get("title", "").strip(),
+        "description": issue.get("description", "").strip(),
+        "category": issue.get("category", "other"),
+        "author": issue.get("author", "Anonymous").strip(),
+        "created": datetime.utcnow().isoformat(),
+    }
+    if not new_issue["title"]:
+        raise HTTPException(status_code=400, detail="Title is required")
+    issues.insert(0, new_issue)
+    _save_issues(issues)
+    return new_issue
+
+
+@app.delete("/issues/{issue_id}")
+async def delete_issue(issue_id: str):
+    """Resolve (delete) an issue."""
+    issues = _load_issues()
+    issues = [i for i in issues if i.get("id") != issue_id]
+    _save_issues(issues)
+    return {"status": "ok"}
+
+
 @app.get("/server-health")
 async def get_server_health():
     """Return current server health status."""