chore(deps): Tier A cross-ecosystem patch/minor sweep

No expected behavior changes; CI verifies. Tracked in Fable #463
under audit note #460.

Flutter (pubspec.yaml):
- flutter_secure_storage ^10.1.0 → ^10.2.0
- mocktail ^1.0.4 → ^1.0.5

Web (package.json + package-lock.json):
- @sveltejs/adapter-static ^3.0.6 → ^3.0.10
- @types/node ^25.6.0 → ^25.9.1
- autoprefixer ^10.4.20 → ^10.5.0
- postcss ^8.4.49 → ^8.5.15
- svelte-check ^4.0.5 → ^4.4.8

Tools (package.json + package-lock.json):
- sharp ^0.33.5 → ^0.34.5 (the lockfile diff is large because
  sharp ships pre-built binaries for many platform/arch combos;
  each version revs all those entries)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/package.json

@@ -12,17 +12,17 @@
     "tokens": "node scripts/tokens-to-css.js"
   },
   "devDependencies": {
-    "@sveltejs/adapter-static": "^3.0.6",
+    "@sveltejs/adapter-static": "^3.0.10",
     "@sveltejs/kit": "^2.8.0",
     "@sveltejs/vite-plugin-svelte": "^4.0.0",
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/svelte": "^5.3.1",
-    "@types/node": "^25.6.0",
-    "autoprefixer": "^10.4.20",
+    "@types/node": "^25.9.1",
+    "autoprefixer": "^10.5.0",
     "jsdom": "^25.0.1",
-    "postcss": "^8.4.49",
+    "postcss": "^8.5.15",
     "svelte": "^5.1.9",
-    "svelte-check": "^4.0.5",
+    "svelte-check": "^4.4.8",
     "tailwindcss": "^3.4.14",
     "typescript": "^5.6.3",
     "vite": "^5.4.10",