perf: drop @lucide/angular, hand-roll used icons - initial bundle 13.68MB -> 2.64MB

@lucide/angular shipped its entire ~1500-icon set in the initial bundle
despite the app only using 85 named-imported icons - confirmed upstream
tree-shaking failure (sideEffects:false, clean named imports, single
non-splittable fesm file). Replaced icon-registry.ts/icon.component.ts
with hand-rolled inline SVG rendering of just the 85 used icons,
transcribed from lucide's own node data for pixel-identical output.
Zero call-site changes - AppIconName and app-icon's public API unchanged.

Also: karma-coverage wired (npm run test:coverage), baseline captured
in docs/SPRINT-PLAN-NEXT.md (32% statements / 18.5% branches).

Cart-modal -> app-dialog migration was attempted and reverted - real
conflicts (backdrop-close, nested-modal escape priority, iframe sizing),
documented in docs/FUTURE_FEATURES.md for a properly scoped follow-up.

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

package.json

@@ -9,6 +9,7 @@
     "build": "ng build",
     "build:dexar": "ng build --configuration=production",
     "test": "ng test --watch=false --browsers=ChromeHeadlessNoSandbox",
+    "test:coverage": "ng test --watch=false --browsers=ChromeHeadlessNoSandbox --code-coverage",
     "watch": "ng build --watch --configuration development",
     "arch:check:boundaries": "node tools/architecture/check-boundaries.mjs",
     "arch:check:cycles": "npx --yes madge --circular --extensions ts src/app --ts-config tsconfig.app.json",
@@ -30,7 +31,6 @@
     "@angular/platform-browser": "22.0.8",
     "@angular/router": "22.0.8",
     "@angular/service-worker": "22.0.8",
-    "@lucide/angular": "^1.25.0",
     "rxjs": "~7.8.0",
     "tslib": "^2.8.0",
     "zone.js": "~0.16.0"
@@ -45,8 +45,9 @@
     "jasmine-core": "~5.5.0",
     "karma": "~6.4.0",
     "karma-chrome-launcher": "~3.2.0",
+    "karma-coverage": "^2.2.1",
     "karma-jasmine": "~5.1.0",
     "karma-jasmine-html-reporter": "~2.1.0",
     "typescript": "~6.0.3"
   }
-}
+}