remove results.md used for testing

.browserslistrc

@@ -1,36 +1,52 @@
 [modern]
 # Modern builds target recent browsers supporting the latest features to minimize transpilation, polyfills, etc.
 # It is served to browsers meeting the following requirements:
-# - released in the last year + current alpha/beta versions
-# - Firefox extended support release (ESR)
-# - with global utilization at or above 0.5%
+# - released in the last 2 years + current alpha/beta versions
 # - exclude dead browsers (no security maintenance for 2+ years)
 # - exclude KaiOS, QQ, and UC browsers due to lack of sufficient feature support data
 unreleased versions
-last 1 year
-Firefox ESR
->= 0.5%
+last 2 years
 not dead
-not KaiOS > 0
 not QQAndroid > 0
 not UCAndroid > 0
 
 [legacy]
-# Legacy builds are served when modern requirements are not met and support browsers:
-# - released in the last 7 years + current alpha/beta versionss
-# - with global utilization at or above 0.05%
-# - exclude dead browsers (no security maintenance for 2+ years)
-# - exclude Opera Mini which does not support web sockets
-unreleased versions
-last 7 years
->= 0.05%
-not dead
-not op_mini all
+# Legacy builds are served when modern requirements are not met.
+# Floors are pinned explicitly (not usage-based) so the support policy is
+# deliberate and does not drift with global usage statistics, which do not
+# represent old tablets and wall displays used as Home Assistant dashboards:
+# - iOS/Safari >= 12: iPad Air 1 / mini 2 / mini 3 (last supported iOS).
+#   Older iPads (iPad 2/3/mini 1 on iOS 9.3, iPad 4 on iOS 10.3) cannot run
+#   the app: their engines lack custom elements, shadow DOM, and/or CSS grid.
+# - Chrome >= 59: Fire OS 5 tablets (Fire 7/HD 8/HD 10 through ~2017) have
+#   their system WebView pinned at Chromium 59 and commonly run Fully Kiosk;
+#   also covers old kiosk browsers and no-longer-updating webviews above it.
+# - Edge >= 79: all Chromium-based Edge. Costs nothing (above the Chrome
+#   floor); mainly catches Edge 109 on Windows 7/8.1 and update-frozen
+#   enterprise installs, whose engines can run the legacy build fine.
+# - Firefox >= 94: the zero-cost floor, not a chased population — pinning it
+#   adds no babel transforms, core-js modules, or Lightning CSS prefixes to
+#   the output. Mozilla-supported Firefox (incl. current ESR) always matches
+#   [modern]; Firefox on old OSes is not supported (use Chrome 109 instead).
+#   If Firefox ever becomes the pin forcing extra output, raise it first.
+# - Samsung >= 9: Samsung Internet on old Galaxy tablets
+Chrome >= 59
+ChromeAndroid >= 59
+Edge >= 79
+Firefox >= 94
+FirefoxAndroid >= 94
+iOS >= 12
+Safari >= 12
+Samsung >= 9
 
 [legacy-sw]
-# Same as legacy plus supports service workers
-unreleased versions
-last 7 years
->= 0.05% and supports serviceworkers
-not dead
-not op_mini all
+# Same as legacy, restricted to browsers that support service workers
+# (currently resolves to the same set; guards the service worker build if the legacy floor ever drops below them)
+Chrome >= 59 and supports serviceworkers
+ChromeAndroid >= 59 and supports serviceworkers
+Edge >= 79 and supports serviceworkers
+Firefox >= 94 and supports serviceworkers
+FirefoxAndroid >= 94 and supports serviceworkers
+iOS >= 12 and supports serviceworkers
+Safari >= 12 and supports serviceworkers
+Samsung >= 9 and supports serviceworkers

build-scripts/bundle-budget.json

@@ -1,15 +1,15 @@
 {
   "_comment": "Initial JS budget (raw/uncompressed bytes) for the cold-load critical entrypoints. Enforced by build-scripts/check-bundle-size.cjs in CI. Re-seed after an intentional change with `--update --headroom=<percent>`.",
   "frontend-modern": {
-    "app": 585518,
-    "core": 57048,
-    "authorize": 552423,
-    "onboarding": 666818
+    "app": 576583,
+    "core": 54790,
+    "authorize": 543547,
+    "onboarding": 655556
   },
   "frontend-legacy": {
-    "app": 887384,
-    "core": 244482,
-    "authorize": 844995,
-    "onboarding": 1008816
+    "app": 717124,
+    "core": 181583,
+    "authorize": 699175,
+    "onboarding": 816133
   }
 }

build-scripts/bundle.cjs

@@ -63,8 +63,10 @@ module.exports.htmlMinifierOptions = {
 };
 
 module.exports.terserOptions = ({ latestBuild, isTestBuild }) => ({
-  safari10: !latestBuild,
-  ecma: latestBuild ? 2015 : 5,
+  // Highest syntax the minifier may emit; it never downlevels. Every browser
+  // in [modern] is well past ES2020 (universal since spring 2020); the
+  // [legacy] floors (Chrome 59 / Safari 12) top out at ES2017.
+  ecma: latestBuild ? 2020 : 2017,
   module: latestBuild,
   format: { comments: false },
   sourceMap: !isTestBuild,

package.json

@@ -172,6 +172,7 @@
     "@vitest/coverage-v8": "4.1.10",
     "babel-loader": "10.1.1",
     "babel-plugin-polyfill-corejs3": "1.0.0",
+    "browserslist": "4.28.6",
     "browserslist-useragent-regexp": "4.1.4",
     "del": "8.0.1",
     "eslint": "10.8.1",
@@ -195,6 +196,7 @@
     "jsdom": "30.0.1",
     "jszip": "3.10.1",
     "license-checker-rseidelsohn": "5.0.1",
+    "lightningcss": "1.32.0",
     "lint-staged": "17.3.0",
     "lit-analyzer": "2.0.3",
     "lodash.merge": "4.6.2",

yarn.lock

@@ -7317,7 +7317,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"browserslist@npm:^4.24.0, browserslist@npm:^4.28.1, browserslist@npm:^4.28.2":
+"browserslist@npm:4.28.6, browserslist@npm:^4.24.0, browserslist@npm:^4.28.1, browserslist@npm:^4.28.2":
   version: 4.28.6
   resolution: "browserslist@npm:4.28.6"
   dependencies:
@@ -9985,6 +9985,7 @@ __metadata:
     babel-loader: "npm:10.1.1"
     babel-plugin-polyfill-corejs3: "npm:1.0.0"
     barcode-detector: "npm:3.2.1"
+    browserslist: "npm:4.28.6"
     browserslist-useragent-regexp: "npm:4.1.4"
     cally: "npm:0.9.2"
     color-name: "npm:2.1.1"
@@ -10029,6 +10030,7 @@ __metadata:
     leaflet-draw: "patch:leaflet-draw@npm%3A1.0.4#./.yarn/patches/leaflet-draw-npm-1.0.4-0ca0ebcf65.patch"
     leaflet.markercluster: "npm:1.5.3"
     license-checker-rseidelsohn: "npm:5.0.1"
+    lightningcss: "npm:1.32.0"
     lint-staged: "npm:17.3.0"
     lit: "npm:3.3.3"
     lit-analyzer: "npm:2.0.3"
@@ -11365,7 +11367,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"lightningcss@npm:^1.32.0":
+"lightningcss@npm:1.32.0, lightningcss@npm:^1.32.0":
   version: 1.32.0
   resolution: "lightningcss@npm:1.32.0"
   dependencies: