perf(build): budget the runtime on what ships, not on source bytes

The runtime budgets measured raw source, which counts comments -- and the
production build minifies, so comments cost a visitor nothing. The metric
therefore rewarded deleting explanatory comments over writing smaller code,
and could not tell a real feature from a wall of prose.

They now measure the minified output, which is what is actually served:
/__wrnexus/reactive.js is its own file, minified, with an immutable year-long
cache. The reactive runtime is 69684 minified against a 80000 budget, from
175246 raw -- roughly 21kB gzipped, fetched once.

Also fixes two real bugs found while testing the showcase:

  - object-valued props were serialised as a bare {...} attribute, which the
    compiler read as interpolation and tried to parse as JavaScript. That
    returned 500 for /components/navbar. Arrays start with [ and were never
    affected, which is why only object props broke. All 108 pages now render.

  - the runtime walked text nodes inside textarea, script and style, so a
    JSON sample in a textarea was evaluated away.

Navbar styles move out of ui.css into the component, matching the rest of the
navigation group. No declarations changed: 4519 before and after.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/ui-visual-contract-0.8.json

@@ -66,7 +66,7 @@
     "packages/ui/components/MetricGrid.wrn": "6018a98c10628ed240ed236ed916c0ff60994d192c3aadafd10bc876be0f9364",
     "packages/ui/components/Modal.wrn": "59d4ae9d6dd2700692d9edecfe53ee868e9f864363a4885961d1813cb2bee51f",
     "packages/ui/components/Nav.wrn": "7dc456b879e9248bde267b986cdcb138b8f3127d98b51e27bc9708129953f5e2",
-    "packages/ui/components/Navbar.wrn": "cf28cf4cdd23c85821d3302e6881115c2c14977e7cb7142d306cf559fea2a518",
+    "packages/ui/components/Navbar.wrn": "7989d25819312014c0a0855370b80b925d53ff735d682fdb61e9677a9dacb7f3",
     "packages/ui/components/PageHeader.wrn": "0761235a4924eec09877be40b292d27b70db22d210be7d8e989493165c20df86",
     "packages/ui/components/Pagination.wrn": "9ceb74745b159150b015bbbb1974c68e14a7d4b92bd03491cb23b8855aa07983",
     "packages/ui/components/PinInput.wrn": "5196f584de8d548a5dfa03688c3c95da3c948cead2662b05e927386ccea74299",
@@ -110,6 +110,6 @@
     "packages/ui/components/progress.wrn": "ba6f4dfcc00f04f34e9533be675bb4a6200c3cdcd7d03fc597377e48520fdec7",
     "packages/ui/components/skeleton.wrn": "ceec8af147b8be08155500e378393ac7c72d819da61b62191c076c80e943d5a9",
     "packages/ui/components/spinner.wrn": "abc4ee3ede2e019289257e9009eee012c880a85839cc220fac6dbe1b780caf52",
-    "packages/ui/ui.css": "eee7da4d1088703a61db8e78c43eb6ff7f1b6a02fd8082d8d722beb65bf78382"
+    "packages/ui/ui.css": "f71641efb0c98b673af70c10dbcea8e693de258ce8620b4f84c64553ea70204e"
   }
 }