feat(web): adopt @vincjo/datatables for all tables, standardize shared components

- Add DataTable.svelte: declarative columns, built-in sorting, sticky headers,
  text truncation, column alignment, configurable widths, optional pagination/search
- 12 built-in renderers: BadgeRenderer, StatusBadgeRenderer (unified risk/severity/
  execution/state/type variant mapping), HealthDotRenderer, RelativeTimeRenderer,
  DateRenderer, DurationRenderer, StatusDotRenderer, SignalActions, ApprovalActions,
  ActivityAction, ActivityCancel
- Migrate Overview (task board), Signals, Ops (3 tables) to DataTable
- Refactor EntityTable treegrid to use shared SortHeader, EmptyState, HealthDotRenderer
- Create shared components: EmptyState, StatusBadge, FilterTabs
- Clean up Knowledge.svelte: replace inline relTime() and typeVariant() with shared utils
- Add width, align, truncate column props; table-fixed layout; rounded-xl borders
- Bump version to 0.11.0

web/package-lock.json

@@ -23,6 +23,7 @@
         "@tailwindcss/vite": "^4.3.2",
         "@tsconfig/svelte": "^5.0.0",
         "@types/d3-force": "^3.0.10",
+        "@vincjo/datatables": "^2.8.1",
         "bits-ui": "^2.18.1",
         "eslint": "^9.0.0",
         "eslint-plugin-svelte": "^2.46.0",
@@ -1969,6 +1970,16 @@
         "url": "https://opencollective.com/eslint"
       }
     },
+    "node_modules/@vincjo/datatables": {
+      "version": "2.8.1",
+      "resolved": "https://registry.npmjs.org/@vincjo/datatables/-/datatables-2.8.1.tgz",
+      "integrity": "sha512-rWl17XkriNyX3fFB5GSThLlhlPDKchFMMSCuaeSYbZCokkwSACjTLtk9v3gg4PltUaXMsJ2XjQcpnPeKJ0xa5A==",
+      "dev": true,
+      "license": "MIT",
+      "peerDependencies": {
+        "svelte": "^5.56.1"
+      }
+    },
     "node_modules/@vitest/expect": {
       "version": "2.1.9",
       "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-2.1.9.tgz",