refactor(theme): single-source the HealthChat Light theme

Author the theme once in apps/web/element.io/healthchat/HealthChat-Light-Theme.json
and sync it into the web (apps/web/config.json) and desktop
(apps/desktop/element.io/healthchat/config.json) configs via
scripts/healthchat-sync-theme.mjs, removing the drifted duplicate.
`pnpm healthchat:theme` writes it; `pnpm lint` runs healthchat:theme:check to
fail on drift.

The canonical palette is the reviewed desktop theme, which reverts the web-only
contrast tweak (f64923ea1a) so web and desktop match.

apps/web/config.json

@@ -8,44 +8,25 @@
     "bug_report_endpoint_url": "https://element.io/bugreports/submit",
     "default_country_code": "GB",
     "default_server_config": {
-        "m.homeserver": {
-            "base_url": "https://matrix.healthchat.ch",
-            "server_name": "healthchat.ch"
-        },
-        "m.identity_server": {
-            "base_url": ""
-        }
+        "m.homeserver": { "base_url": "https://matrix.healthchat.ch", "server_name": "healthchat.ch" },
+        "m.identity_server": { "base_url": "" }
     },
     "default_theme": "custom-HealthChat Light",
     "disable_custom_urls": true,
     "disable_guests": true,
     "element_call": {},
-    "embedded_pages": {
-        "homeUrl": ""
-    },
+    "embedded_pages": { "homeUrl": "" },
     "enable_presence_by_hs_url": "",
     "features": {},
     "integrations_jitsi_widget_url": "https://scalar.vector.im/api/widgets/jitsi.html",
     "integrations_rest_url": "https://scalar.vector.im/api",
     "integrations_ui_url": "https://scalar.vector.im/",
-    "integrations_widgets_urls": [
-        "https://scalar.vector.im/api"
-    ],
-    "jitsi": {
-        "preferred_domain": "jitsi.healthchat.ch"
-    },
+    "integrations_widgets_urls": ["https://scalar.vector.im/api"],
+    "jitsi": { "preferred_domain": "jitsi.healthchat.ch" },
     "logout_redirect_url": "",
     "matrix_to_url": "https://to.healthchat.ch",
-    "room_directory": {
-        "servers": [
-            "matrix.org"
-        ]
-    },
-    "sso_redirect_options": {
-        "immediate": true,
-        "on_welcome_page": true,
-        "on_login_page": true
-    },
+    "room_directory": { "servers": ["matrix.org"] },
+    "sso_redirect_options": { "immediate": true, "on_welcome_page": true, "on_login_page": true },
     "setting_defaults": {
         "UIFeature.deactivate": false,
         "UIFeature.advancedEncryption": false,
@@ -55,7 +36,6 @@
         "UIFeature.advancedSettings": false,
         "UIFeature.feedback": false,
         "custom_themes": [
-            "HealthChat Light",
             {
                 "name": "HealthChat Light",
                 "is_dark": false,
@@ -74,8 +54,8 @@
                     "timeline-highlights-color": "#d9d9d9",
                     "timeline-text-color": "#473e3e",
                     "timeline-text-secondary-color": "#9b9898",
-                    "secondary-content": "#6e6a6a",
-                    "tertiary-content": "#6e6a6a",
+                    "secondary-content": "#9b9898",
+                    "tertiary-content": "#9b9898",
                     "focus-bg-color": "#d9d9d9",
                     "menu-selected-color": "#d9d9d9",
                     "other-user-pill-bg-color": "#376A91",
@@ -83,30 +63,30 @@
                     "reaction-row-button-selected-bg-color": "#d9d9d9",
                     "togglesw-off-color": "#9b9898",
                     "avatar-background-colors": ["#12325c", "#1f4d85", "#376A91"],
-                    "username-colors": ["#12325c", "#2a4063", "#1f4d85", "#376A91", "#473e3e", "#1f4d85", "#2a4063", "#12325c"]
-                },
-                "fonts": {
-                    "general": "\"Century Gothic\", \"Futura\", \"Trebuchet MS\", \"Arial\", sans-serif"
+                    "username-colors": [
+                        "#12325c",
+                        "#2a4063",
+                        "#1f4d85",
+                        "#376A91",
+                        "#473e3e",
+                        "#1f4d85",
+                        "#2a4063",
+                        "#12325c"
+                    ]
                 },
+                "fonts": { "general": "\"Century Gothic\", \"Futura\", \"Trebuchet MS\", \"Arial\", sans-serif" },
                 "compound": {
                     "--cpd-color-text-action-accent": "#1f4d85",
                     "--cpd-color-bg-action-primary-rest": "#1f4d85",
                     "--cpd-color-bg-action-primary-hovered": "#2a4063",
                     "--cpd-color-bg-action-primary-pressed": "#12325c",
                     "--cpd-color-text-link-external": "#1f4d85",
-                    "--cpd-color-icon-accent-tertiary": "#376A91",
-                    "--cpd-color-icon-tertiary": "#5c6470",
-                    "--cpd-color-icon-quaternary": "#7c8591",
-                    "--cpd-color-icon-accent-primary": "#1f4d85",
-                    "--cpd-color-icon-info-primary": "#1f4d85"
+                    "--cpd-color-icon-accent-tertiary": "#376A91"
                 }
             }
         ]
     },
     "show_labs_settings": false,
     "modules": ["/modules/healthchat-module.js"],
-    "ch.healthchat": {
-        "api_base_url": "http://localhost:5001",
-        "elements_base_url": "/modules/elements"
-    }
+    "ch.healthchat": { "api_base_url": "http://localhost:5001", "elements_base_url": "/modules/elements" }
 }

apps/web/element.io/healthchat/HealthChat-Light-Theme.json

@@ -0,0 +1,41 @@
+{
+    "name": "HealthChat Light",
+    "is_dark": false,
+    "colors": {
+        "accent-color": "#1f4d85",
+        "primary-color": "#1f4d85",
+        "alert": "#df8e1d",
+        "warning-color": "#d20f39",
+        "sidebar-color": "#12325c",
+        "roomlist-background-color": "#f5f5f5",
+        "roomlist-highlights-color": "#d9d9d9",
+        "roomlist-separator-color": "#9b9898",
+        "roomlist-text-color": "#473e3e",
+        "roomlist-text-secondary-color": "#9b9898",
+        "timeline-background-color": "#ffffff",
+        "timeline-highlights-color": "#d9d9d9",
+        "timeline-text-color": "#473e3e",
+        "timeline-text-secondary-color": "#9b9898",
+        "secondary-content": "#9b9898",
+        "tertiary-content": "#9b9898",
+        "focus-bg-color": "#d9d9d9",
+        "menu-selected-color": "#d9d9d9",
+        "other-user-pill-bg-color": "#376A91",
+        "room-highlight-color": "#376A91",
+        "reaction-row-button-selected-bg-color": "#d9d9d9",
+        "togglesw-off-color": "#9b9898",
+        "avatar-background-colors": ["#12325c", "#1f4d85", "#376A91"],
+        "username-colors": ["#12325c", "#2a4063", "#1f4d85", "#376A91", "#473e3e", "#1f4d85", "#2a4063", "#12325c"]
+    },
+    "fonts": {
+        "general": "\"Century Gothic\", \"Futura\", \"Trebuchet MS\", \"Arial\", sans-serif"
+    },
+    "compound": {
+        "--cpd-color-text-action-accent": "#1f4d85",
+        "--cpd-color-bg-action-primary-rest": "#1f4d85",
+        "--cpd-color-bg-action-primary-hovered": "#2a4063",
+        "--cpd-color-bg-action-primary-pressed": "#12325c",
+        "--cpd-color-text-link-external": "#1f4d85",
+        "--cpd-color-icon-accent-tertiary": "#376A91"
+    }
+}

apps/web/element.io/healthchat/README

@@ -0,0 +1,25 @@
+HealthChat theme — single source of truth
+=========================================
+
+  HealthChat-Light-Theme.json   The canonical "HealthChat Light" theme.
+
+Edit the palette HERE and nowhere else. apps/web/scripts/healthchat-sync-theme.mjs injects
+it into the element-web configs that ship it:
+
+  - apps/web/config.json                            (dev server; also baked into the web image)
+  - apps/desktop/element.io/healthchat/config.json  (desktop variant, bundled into the app)
+
+After editing, run:
+  pnpm --filter element-web healthchat:theme
+`pnpm lint` runs `healthchat:theme:check`, which fails if a config is out of sync — so an
+un-propagated edit is caught in CI.
+
+Production web deployment
+-------------------------
+The production web client is deployed by matrix-docker-ansible-deploy, whose
+matrix-client-element role renders config.json from host_vars (no upstream role change).
+It carries an INLINE copy of this theme in
+  inventory/host_vars/matrix.healthchat.ch/vars.yml
+    (matrix_client_element_setting_defaults_custom_themes)
+When you change the theme here, re-copy it into that host_vars block. themes_enabled is off
+there, so the (stale) Novaloop-AG/element-themes repo does not append an older theme.

apps/web/package.json

@@ -18,13 +18,15 @@
         "i18n:lint": "matrix-i18n-lint && prettier --log-level=silent --write src/i18n/strings/ --ignore-path /dev/null",
         "i18n:diff": "cp src/i18n/strings/en_EN.json src/i18n/strings/en_EN_orig.json && pnpm i18n && matrix-compare-i18n-files src/i18n/strings/en_EN_orig.json src/i18n/strings/en_EN.json",
         "rethemendex": "sh ./res/css/rethemendex.sh",
+        "healthchat:theme": "node scripts/healthchat-sync-theme.mjs",
+        "healthchat:theme:check": "node scripts/healthchat-sync-theme.mjs --check",
         "build": "nx build",
         "build-stats": "nx build --json=webpack-stats.json",
         "vendor:modernizr": "modernizr -c .modernizr.json -d src/vector/modernizr.js && mv src/vector/modernizr.js src/vector/modernizr.cjs",
         "vendor:jitsi": "curl -s https://meet.element.io/libs/external_api.min.js > ./res/jitsi_external_api.min.js",
         "dist": "./scripts/package.sh",
         "start": "nx start",
-        "lint": "pnpm lint:types && pnpm lint:js && pnpm lint:style",
+        "lint": "pnpm healthchat:theme:check && pnpm lint:types && pnpm lint:js && pnpm lint:style",
         "lint:js": "eslint --max-warnings 0 src test playwright module_system",
         "lint:js-fix": "eslint --fix src test playwright module_system",
         "lint:types": "nx lint:types",

apps/web/scripts/healthchat-sync-theme.mjs

@@ -0,0 +1,70 @@
+#!/usr/bin/env node
+/*
+ * HealthChat theme sync.
+ *
+ * Single source of truth for the "HealthChat Light" theme lives in
+ *   apps/web/element.io/healthchat/HealthChat-Light-Theme.json
+ * This script injects it into every element-web config that ships the theme, so the palette
+ * is authored once and never drifts between the dev and desktop configs.
+ *
+ * The production web deployment (matrix-docker-ansible-deploy) renders its config.json from
+ * host_vars and carries an inline copy of this theme; re-copy this file there when it changes.
+ *
+ * Usage:
+ *   node apps/web/scripts/healthchat-sync-theme.mjs          # write the theme into all configs
+ *   node apps/web/scripts/healthchat-sync-theme.mjs --check  # exit 1 if any config is out of sync
+ *
+ * Run `pnpm --filter element-web healthchat:theme` after editing the canonical theme;
+ * the --check variant runs in lint/CI to catch an un-synced edit.
+ */
+import { readFileSync, writeFileSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+import { dirname, resolve } from "node:path";
+import prettier from "prettier";
+
+const scriptDir = dirname(fileURLToPath(import.meta.url));
+const repoRoot = resolve(scriptDir, "../../..");
+
+const CANONICAL = resolve(repoRoot, "apps/web/element.io/healthchat/HealthChat-Light-Theme.json");
+
+// Configs that must carry the theme in setting_defaults.custom_themes.
+const TARGETS = [
+    "apps/web/config.json", // dev server config (also served by the web Docker image)
+    "apps/desktop/element.io/healthchat/config.json", // desktop variant config bundled into the app
+];
+
+const check = process.argv.includes("--check");
+
+const theme = JSON.parse(readFileSync(CANONICAL, "utf8"));
+
+let changed = 0;
+for (const rel of TARGETS) {
+    const path = resolve(repoRoot, rel);
+    const raw = readFileSync(path, "utf8");
+    const config = JSON.parse(raw);
+    config.setting_defaults ??= {};
+    config.setting_defaults.custom_themes = [theme];
+
+    // Format identically to `prettier --write` so the output is byte-for-byte what the
+    // repo's formatting lint expects, keeping --check stable.
+    const options = await prettier.resolveConfig(path);
+    const next = await prettier.format(JSON.stringify(config), { ...options, filepath: path });
+
+    if (next === raw) {
+        continue;
+    }
+    changed++;
+    if (check) {
+        console.error(`out of sync: ${rel} (run: pnpm --filter element-web healthchat:theme)`);
+    } else {
+        writeFileSync(path, next);
+        console.log(`synced theme -> ${rel}`);
+    }
+}
+
+if (check) {
+    if (changed > 0) process.exit(1);
+    console.log("all configs in sync with the canonical HealthChat theme");
+} else if (changed === 0) {
+    console.log("all configs already in sync");
+}