feat: show git commit SHA as version in footer

TERM v1.0 → TERM v5ca5e01 (or whatever SHA is building).
GIT_SHA is injected via vite define from Makefile.

web/package-lock.json

@@ -18,6 +18,7 @@
         "zustand": "^4.5.2"
       },
       "devDependencies": {
+        "@types/node": "^26.1.0",
         "@types/react": "^18.3.3",
         "@types/react-dom": "^18.3.7",
         "@vitejs/plugin-react": "^4.3.1",
@@ -1399,6 +1400,16 @@
       "integrity": "sha512-GsCCIZDE/p3i96vtEqx+7dBUGXrc7zeSK3wwPHIaRThS+9OhWIXRqzs4d6k1SVU8g91DrNRWxWUGhp5KXQb2VA==",
       "license": "MIT"
     },
+    "node_modules/@types/node": {
+      "version": "26.1.0",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.1.0.tgz",
+      "integrity": "sha512-O0A1G3xPGy4w7AgQdAQYUlQ+BKk2Oovw8eRpofyp5KdBZULnbe+WqaOVNrm705SHphCiG4XHsACrSmPu1f+Kgw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~8.3.0"
+      }
+    },
     "node_modules/@types/prop-types": {
       "version": "15.7.15",
       "resolved": "https://registry.npmjs.org/@types/prop-types/-/prop-types-15.7.15.tgz",
@@ -4210,6 +4221,13 @@
         "node": ">=14.17"
       }
     },
+    "node_modules/undici-types": {
+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.3.0.tgz",
+      "integrity": "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/unified": {
       "version": "11.0.5",
       "resolved": "https://registry.npmjs.org/unified/-/unified-11.0.5.tgz",