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>

karma.conf.js

@@ -12,6 +12,7 @@ module.exports = function (config) {
       require('karma-jasmine'),
       require('karma-chrome-launcher'),
       require('karma-jasmine-html-reporter'),
+      require('karma-coverage'),
     ],
     browsers: ['ChromeHeadlessNoSandbox'],
     customLaunchers: {
@@ -20,7 +21,12 @@ module.exports = function (config) {
         flags: ['--no-sandbox', '--disable-gpu', '--disable-dev-shm-usage'],
       },
     },
-    reporters: ['progress'],
+    reporters: ['progress', 'coverage'],
+    coverageReporter: {
+      dir: require('path').join(__dirname, 'coverage'),
+      subdir: '.',
+      reporters: [{ type: 'text-summary' }, { type: 'html' }, { type: 'lcovonly' }],
+    },
     restartOnFileChange: true,
   });
 };