diff --git a/.changeset/pre.json b/.changeset/pre.json
index fa7f7389..d8c9c9b5 100644
--- a/.changeset/pre.json
+++ b/.changeset/pre.json
@@ -11,6 +11,7 @@
     "accordion-mycsc-colors",
     "alert-heading-prop",
     "alert-mycsc-redesign",
+    "app-defaults",
     "autocomplete-external-mode",
     "autocomplete-option-content-attributes",
     "autocomplete-search-magnifier",
@@ -19,6 +20,9 @@
     "chart-data-export",
     "chart-slots-vivid",
     "chart-tokens",
+    "ci-gate",
+    "component-tests-harness",
+    "conformance-suites",
     "dark-mode-mycsc-retune",
     "dark-mode-subtle-ink",
     "dark-mode-vivid-retune",
@@ -26,9 +30,12 @@
     "divider-token-dark-mode",
     "docs-lint-formatting-gate",
     "dropdown-hide-details-restore",
+    "example-smoke",
     "export-default-seeds",
     "fix-autocomplete-textfield-states",
+    "fullscreen-panel-narrow-viewport",
     "ghost-soft-tint",
+    "harness-monotonic-clock",
     "logo-white-in-dark",
     "menu-item-active-and-icon",
     "modal-focus-ring-and-initial-focus",
@@ -36,6 +43,8 @@
     "progress-bar-aria-busy",
     "progress-circle-component",
     "radio-self-rendering",
+    "regression-specs-wave-1",
+    "regression-specs-wave-2",
     "select-all-row",
     "select-autocomplete-multiple",
     "select-selected-row-check",
@@ -47,6 +56,7 @@
     "tooltip-popover-components",
     "transient-panel-peek",
     "tree-select-component",
+    "visual-baselines-linux-only",
     "vue-rewrite-major"
   ]
 }
diff --git a/packages/csc-ui-react/CHANGELOG.md b/packages/csc-ui-react/CHANGELOG.md
index 2930a821..ac2153ce 100644
--- a/packages/csc-ui-react/CHANGELOG.md
+++ b/packages/csc-ui-react/CHANGELOG.md
@@ -1,5 +1,51 @@
 # @cscfi/csc-ui-react
 
+## 4.0.0-alpha.15
+
+### Minor Changes
+
+- [#275](https://github.com/CSCfi/ui/pull/275) [`5855ff9`](https://github.com/CSCfi/ui/commit/5855ff924450fadbb3267d17b61a2ffeeaae60a5) Thanks [@razorfever](https://github.com/razorfever)! - Add app-wide prop defaults (ADR-0048): `applyDefaults()` sets a preference
+  prop once for every instance of a tag, and `resetDefaults()` clears it.
+
+  - `applyDefaults({ 'c-text-field': { labelOnTop: true } })` makes every text
+    field label on top; `applyDefaults({ 'c-select': { texts } })` translates
+    every select in one call. Later calls merge with earlier ones, a key set to
+    `undefined` clears it, and mounted elements follow live — a locale switch is
+    one call.
+  - Only defaultable props take part, badged "app default" in each component's
+    Properties table and typed as `AppDefaults`: `labelOnTop`, `hideDetails`,
+    `shadow` and `size` on c-text-field, c-select, c-autocomplete and
+    c-tree-select; `itemsPerPage` on the three list fields; `texts` on those
+    three and c-data-table. An unknown tag or prop throws.
+  - An explicit attribute or property on an instance always wins over the app
+    default; `texts` merges key by key over the built-in strings. Both functions
+    are re-exported from `@cscfi/csc-ui-react`.
+
+  Two visible changes for these props: when unset, the element property now
+  reads `undefined` instead of the built-in (`el.labelOnTop`, `el.size`,
+  `el.itemsPerPage`), and the host no longer carries the reflected default
+  attributes `size="default"` / `items-per-page="6"`.
+
+- [#275](https://github.com/CSCfi/ui/pull/275) [`fd4bf56`](https://github.com/CSCfi/ui/commit/fd4bf56ba38095517dc0c9f95fe0bea263d29e5d) Thanks [@razorfever](https://github.com/razorfever)! - Value-selection fields open a fullscreen panel on narrow viewports. Below
+  760px, `c-autocomplete` and `c-tree-select` no longer anchor their panel under
+  the field: it covers the viewport with a heading row (the field's label and a
+  close button), the search input pinned beneath it and the options filling the
+  rest, following the on-screen keyboard so the search stays visible. The page
+  behind the panel is inert until it closes. `c-select`'s existing phone layout
+  now covers the whole viewport (no gaps below the small viewport or at the
+  corners), follows the keyboard the same way and gains the same heading row.
+  The close button's label is the new `closePanel` text; the row exposes the
+  `heading-row`, `heading` and `close` parts.
+
+  Transient panels (`c-menu`, `c-popover`, `c-autocomplete`, `c-tree-select`) no
+  longer close when a scroll or drag gesture starts outside them: light dismiss
+  now needs the press and its release both outside, as for a native popover.
+
+### Patch Changes
+
+- Updated dependencies [[`5855ff9`](https://github.com/CSCfi/ui/commit/5855ff924450fadbb3267d17b61a2ffeeaae60a5), [`fd4bf56`](https://github.com/CSCfi/ui/commit/fd4bf56ba38095517dc0c9f95fe0bea263d29e5d)]:
+  - @cscfi/csc-ui@4.0.0-alpha.15
+
 ## 4.0.0-alpha.14
 
 ### Minor Changes
diff --git a/packages/csc-ui-react/package.json b/packages/csc-ui-react/package.json
index c649878b..d8baed59 100644
--- a/packages/csc-ui-react/package.json
+++ b/packages/csc-ui-react/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@cscfi/csc-ui-react",
-  "version": "4.0.0-alpha.14",
+  "version": "4.0.0-alpha.15",
   "description": "React components for the @cscfi/csc-ui custom elements, generated from the Custom Elements Manifest.",
   "author": "My CSC Team <suiteamsui@gmail.com>",
   "type": "module",
diff --git a/packages/csc-ui/CHANGELOG.md b/packages/csc-ui/CHANGELOG.md
index e59e8806..e519373d 100644
--- a/packages/csc-ui/CHANGELOG.md
+++ b/packages/csc-ui/CHANGELOG.md
@@ -1,5 +1,46 @@
 # @cscfi/csc-ui
 
+## 4.0.0-alpha.15
+
+### Minor Changes
+
+- [#275](https://github.com/CSCfi/ui/pull/275) [`5855ff9`](https://github.com/CSCfi/ui/commit/5855ff924450fadbb3267d17b61a2ffeeaae60a5) Thanks [@razorfever](https://github.com/razorfever)! - Add app-wide prop defaults (ADR-0048): `applyDefaults()` sets a preference
+  prop once for every instance of a tag, and `resetDefaults()` clears it.
+
+  - `applyDefaults({ 'c-text-field': { labelOnTop: true } })` makes every text
+    field label on top; `applyDefaults({ 'c-select': { texts } })` translates
+    every select in one call. Later calls merge with earlier ones, a key set to
+    `undefined` clears it, and mounted elements follow live — a locale switch is
+    one call.
+  - Only defaultable props take part, badged "app default" in each component's
+    Properties table and typed as `AppDefaults`: `labelOnTop`, `hideDetails`,
+    `shadow` and `size` on c-text-field, c-select, c-autocomplete and
+    c-tree-select; `itemsPerPage` on the three list fields; `texts` on those
+    three and c-data-table. An unknown tag or prop throws.
+  - An explicit attribute or property on an instance always wins over the app
+    default; `texts` merges key by key over the built-in strings. Both functions
+    are re-exported from `@cscfi/csc-ui-react`.
+
+  Two visible changes for these props: when unset, the element property now
+  reads `undefined` instead of the built-in (`el.labelOnTop`, `el.size`,
+  `el.itemsPerPage`), and the host no longer carries the reflected default
+  attributes `size="default"` / `items-per-page="6"`.
+
+- [#275](https://github.com/CSCfi/ui/pull/275) [`fd4bf56`](https://github.com/CSCfi/ui/commit/fd4bf56ba38095517dc0c9f95fe0bea263d29e5d) Thanks [@razorfever](https://github.com/razorfever)! - Value-selection fields open a fullscreen panel on narrow viewports. Below
+  760px, `c-autocomplete` and `c-tree-select` no longer anchor their panel under
+  the field: it covers the viewport with a heading row (the field's label and a
+  close button), the search input pinned beneath it and the options filling the
+  rest, following the on-screen keyboard so the search stays visible. The page
+  behind the panel is inert until it closes. `c-select`'s existing phone layout
+  now covers the whole viewport (no gaps below the small viewport or at the
+  corners), follows the keyboard the same way and gains the same heading row.
+  The close button's label is the new `closePanel` text; the row exposes the
+  `heading-row`, `heading` and `close` parts.
+
+  Transient panels (`c-menu`, `c-popover`, `c-autocomplete`, `c-tree-select`) no
+  longer close when a scroll or drag gesture starts outside them: light dismiss
+  now needs the press and its release both outside, as for a native popover.
+
 ## 4.0.0-alpha.14
 
 ### Minor Changes
diff --git a/packages/csc-ui/package.json b/packages/csc-ui/package.json
index 0e9236a5..68aa4483 100644
--- a/packages/csc-ui/package.json
+++ b/packages/csc-ui/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@cscfi/csc-ui",
-  "version": "4.0.0-alpha.14",
+  "version": "4.0.0-alpha.15",
   "description": "Vue 3-based replacement for @cscfi/csc-ui — same custom element tag names, Vue v-model contract.",
   "type": "module",
   "main": "./dist/csc-ui.js",