Unify CI and justfile: all workflows call just recipes

- justfile: extract ios_scheme/ios_sim/ios_spm/runner_temp variables; add
  ios-resolve (SPM dep cache), ios-archive, ios-export recipes; pipe xcodebuild
  through xcpretty with raw fallback in ios-build/ios-test
- ios.yaml: replace raw xcodebuild calls with just ios-build / just ios-test;
  install just via brew; uncommented archive job stub now calls just ios-archive
  && just ios-export; add justfile to path trigger
- ci-scraper.yaml: install just via extractions/setup-just@v2; use just lint /
  just test; fix upload-artifact v3 -> v4; add justfile to path trigger
- ci-ui.yaml: install just; use just ui-install / just ui-check / just ui-build;
  add justfile to path trigger

.gitea/workflows/ci-ui.yaml

@@ -5,17 +5,15 @@ on:
     branches: ["main", "master"]
     paths:
       - "ui/**"
+      - "justfile"
       - ".gitea/workflows/ci-ui.yaml"
   pull_request:
     branches: ["main", "master"]
     paths:
       - "ui/**"
+      - "justfile"
       - ".gitea/workflows/ci-ui.yaml"
 
-defaults:
-  run:
-    working-directory: ui
-
 jobs:
   # ── type-check & build ───────────────────────────────────────────────────────
   build:
@@ -30,11 +28,14 @@ jobs:
           cache: npm
           cache-dependency-path: ui/package-lock.json
 
+      - name: Install just
+        uses: extractions/setup-just@v2
+
       - name: Install dependencies
-        run: npm ci
+        run: just ui-install
 
       - name: Type check
-        run: npm run check
+        run: just ui-check
 
       - name: Build
-        run: npm run build
+        run: just ui-build