fix(ssr): resolve EventSource SSR violations and implement best practices

- Fix EventSource is not defined error in queue dashboard
- Add browser guards for all EventSource usage
- Replace static constants (EventSource.OPEN/CLOSED) with numeric values
- Fix setInterval SSR violation in LLM health indicator
- Replace $effect anti-pattern with onMount in share page
- Add comprehensive SvelteKit SSR best practices documentation
- Add SSR audit and testing verification

All changes follow SvelteKit best practices and are verified against
official documentation. Production build succeeds with no SSR errors.

Closes: FixEventSourceSSR
See: docs/outcomes/FixEventSourceSSR.md

package-lock.json

@@ -8,8 +8,11 @@
             "name": "insta-recipe",
             "version": "0.0.1",
             "dependencies": {
+                "@types/uuid": "^10.0.0",
+                "date-fns": "^4.1.0",
                 "openai": "^4.20.0",
                 "playwright": "^1.56.1",
+                "uuid": "^13.0.0",
                 "zod": "^3.23.0"
             },
             "devDependencies": {
@@ -3505,6 +3508,12 @@
             "dev": true,
             "license": "MIT"
         },
+        "node_modules/@types/uuid": {
+            "version": "10.0.0",
+            "resolved": "https://registry.npmjs.org/@types/uuid/-/uuid-10.0.0.tgz",
+            "integrity": "sha512-7gqG38EyHgyP1S+7+xomFtL+ZNHcKv6DwNaCZmJmo1vgMugyF3TCnXVg4t1uk89mLNwnLtnY3TpOpCOyp1/xHQ==",
+            "license": "MIT"
+        },
         "node_modules/@typescript-eslint/eslint-plugin": {
             "version": "8.48.0",
             "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.48.0.tgz",
@@ -4733,6 +4742,16 @@
                 "url": "https://github.com/sponsors/ljharb"
             }
         },
+        "node_modules/date-fns": {
+            "version": "4.1.0",
+            "resolved": "https://registry.npmjs.org/date-fns/-/date-fns-4.1.0.tgz",
+            "integrity": "sha512-Ukq0owbQXxa/U3EGtsdVBkR1w7KOQ5gIBqdH2hkvknzZPYvBxb/aa6E8L7tmjFtkwZBu3UXBbjIgPo/Ez4xaNg==",
+            "license": "MIT",
+            "funding": {
+                "type": "github",
+                "url": "https://github.com/sponsors/kossnocorp"
+            }
+        },
         "node_modules/debug": {
             "version": "4.4.3",
             "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
@@ -9571,6 +9590,19 @@
             "dev": true,
             "license": "MIT"
         },
+        "node_modules/uuid": {
+            "version": "13.0.0",
+            "resolved": "https://registry.npmjs.org/uuid/-/uuid-13.0.0.tgz",
+            "integrity": "sha512-XQegIaBTVUjSHliKqcnFqYypAd4S+WCYt5NIeRs6w/UAry7z8Y9j5ZwRRL4kzq9U3sD6v+85er9FvkEaBpji2w==",
+            "funding": [
+                "https://github.com/sponsors/broofa",
+                "https://github.com/sponsors/ctavan"
+            ],
+            "license": "MIT",
+            "bin": {
+                "uuid": "dist-node/bin/uuid"
+            }
+        },
         "node_modules/vite": {
             "version": "6.4.1",
             "resolved": "https://registry.npmjs.org/vite/-/vite-6.4.1.tgz",