test(decnet_web): raise coverage floor after DeckyFleet split

Phase 2 lands. DeckyFleet.tsx dropped from 1,674 to 274 LOC; the
fleet page is now a thin composition of useDeckyFleet + 6
extracted children (DeckyInspectPanel, IntervalEditor, DeckyCard,
DeployWizard, DeckyFilters, DeckyGridEmpty), each with co-located
tests.

Lock the gain by bumping the threshold floor in vite.config.ts:

  lines       7  -> 11
  functions   6  -> 10
  branches    5  -> 8
  statements  7  -> 11

Phase 2 final scoreboard: 21 test files, 98 tests, all green.

decnet_web/vite.config.ts

@@ -15,13 +15,14 @@ export default defineConfig({
       include: ['src/**/*.{ts,tsx}'],
       exclude: ['src/**/*.d.ts', 'src/test/**', 'src/main.tsx'],
       // Baseline floors. Each refactor PR raises these; never lower.
-      // Locked in after Phase 1 (AttackerDetail split: hook + 6 sections,
-      // 45 tests across 9 files): 7.78% lines, 5.35% branches.
+      // Phase 2 (DeckyFleet split): page shell down from 1,674 to 274
+      // LOC; hook + 6 children, 28 new tests. Suite: 21 files, 98 tests,
+      // 11.95% lines / 8.78% branches.
       thresholds: {
-        lines: 7,
-        functions: 6,
-        branches: 5,
-        statements: 7,
+        lines: 11,
+        functions: 10,
+        branches: 8,
+        statements: 11,
       },
     },
   },