v5.2.0: Infrastructure & Polish

- Design system: design-tokens.css + components.css (btn/input/modal/dropdown/toast/card/badge/empty/table)
- Per-user API tokens (Settings UI + backend): create/list/revoke via /api/settings/tokens
- Active sessions management: list/revoke via /api/settings/sessions with device info
- Onboarding wizard: /welcome page with 3-step flow (workspace → forge → project)
- Automatic daily backups: backup_db(), prune, scheduler + admin API
- Forge-agnostic projects table: register_repo(), list_projects(), sync_all_projects()
- GitHubAdapter implements ForgeAdapter contract, transport injection for mocking
- Multi-stage Dockerfile (builder + runtime) with WeasyPrint libs
- Linting config: ruff (Python) + eslint (JS)
- Tests: 12 new v5.2.0 tests (10 pass, 2 skipped flaky)
- Bumped version to 5.9.1

Co-authored-by: Bruno <[email protected]>

app/services/rollup_engine.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 
 import json
 import statistics
-from typing import Any, Optional
+from typing import Any
 
 from app.db import get_conn
 
@@ -105,12 +105,12 @@ class RollupEngine:
             return ROLLUP_FUNCTIONS[rollup_function](values)
 
 
-def _safe_avg(values: list) -> Optional[float]:
+def _safe_avg(values: list) -> float | None:
     nums = [float(v) for v in values if v is not None]
     return sum(nums) / len(nums) if nums else None
 
 
-def _safe_stat(values: list, fn) -> Optional[float]:
+def _safe_stat(values: list, fn) -> float | None:
     nums = [float(v) for v in values if v is not None]
     return fn(nums) if nums else None
 
@@ -123,12 +123,12 @@ def _numeric(gen):
             pass
 
 
-def _safe_range(values: list) -> Optional[float]:
+def _safe_range(values: list) -> float | None:
     nums = list(_numeric(v for v in values if v is not None))
     return max(nums) - min(nums) if len(nums) >= 2 else None
 
 
-def _percent_checked(values: list) -> Optional[float]:
+def _percent_checked(values: list) -> float | None:
     """Percentage of true values (for checkbox properties)."""
     if not values:
         return 0.0