feat(Resizable): createResizable drives a plain handle element, with one separator derivation

.changeset/create-resizable-internal.md

@@ -0,0 +1,7 @@
+---
+'@astryxdesign/core': patch
+---
+
+[chore] The configuration-object `useResizable` builds on one internal resize region, through the same size model as before, so the region's state has one implementation.
+
+@vjeux

.changeset/create-resizable-plain-handle.md

@@ -0,0 +1,7 @@
+---
+'@astryxdesign/core': patch
+---
+
+[chore] The internal resize factory can drive a plain handle element: it gives the element the separator's role, name, value and tab stop, and answers its pointer drag, keys, Enter and double-click. ResizeHandle and the factory derive the separator's attributes from one helper, with no behavior change.
+
+@vjeux

.changeset/resizable-percentage-default-after-hydration.md

@@ -0,0 +1,7 @@
+---
+'@astryxdesign/core': patch
+---
+
+[fix] A server-rendered `useResizable` region whose `defaultSize` is a percentage and that has no `containerRef` hydrates with the server's markup, then resolves the percentage against the window, instead of keeping the size the server resolved.
+
+@vjeux

.changeset/resizable-saved-size-after-hydration.md

@@ -0,0 +1,7 @@
+---
+'@astryxdesign/core': patch
+---
+
+[fix] A server-rendered `useResizable` region with an `autoSaveId` hydrates with the server's markup and takes its saved size in the next commit, so hydration no longer reports a mismatch and the handle announces the saved size.
+
+@vjeux

.changeset/resize-handle-disabled-tab-stop.md

@@ -0,0 +1,7 @@
+---
+'@astryxdesign/core': patch
+---
+
+[fix] A disabled `ResizeHandle` keeps its tab stop. Before, it left the tab order, so keyboard users could not reach it to hear that it is disabled. Now it stays in the tab order, as a disabled control keeps its tab stop, and it still ignores pointer and keyboard input and says so with `aria-disabled`.
+
+@vjeux

docs/architecture/internationalization.md

@@ -440,7 +440,7 @@ callers remain conformance work and do not relax INV1a, INV8, INV9, or INV10.
 | INV1, INV1a, INV7  | hardcoded-string lint, catalog tests, component translation tests with a non-English provider                                                                                                                                                                                                                                                                                                                                                                                                                                   | Astryx-owned text bypasses the catalog, an announcement or count is assembled from fragments or a hand-rolled plural, or non-string output reaches visible/AT attributes                                                                                                                                                                                                      |
 | INV2, INV13, INV14 | export drift checks, public i18n tests, compatibility review                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | A parallel/replacement runtime lands without migration, or client hooks claim server behavior                                                                                                                                                                                                                                                                                 |
 | INV3–INV5          | resolver and provider rerender tests                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | no-provider output depends on the host, locale swaps stay stale, fallback order changes, or malformed-locale behavior is described as graceful                                                                                                                                                                                                                                |
-| INV3a              | factory unit tests: a flat option or `labels` key replaces its message, including under a provider, and outside a provider its absence announces or shows shipped English; wrapper tests: under a non-English provider its absence gives the translation. Evidence gap: no factory test covers a flat option or `labels` key yet                                                                                                                                                                                                | a factory announces or shows Astryx text that no option or `labels` key can replace, groups more than one string outside one `labels` object, takes a translator, ignores a given string, or gives something other than the catalog message when it is absent                                                                                                                 |
+| INV3a              | factory unit tests: a flat option or `labels` key replaces its message, including under a provider, and outside a provider its absence announces or shows shipped English; wrapper tests: under a non-English provider its absence gives the translation. Evidence gap: no factory test covers a `labels` key, or a flat option under a provider, yet                                                                                                                                                                           | a factory announces or shows Astryx text that no option or `labels` key can replace, groups more than one string outside one `labels` object, takes a translator, ignores a given string, or gives something other than the catalog message when it is absent                                                                                                                 |
 | INV6               | `check:i18n-catalog`, key-format lint, and focused mutation tests                                                                                                                                                                                                                                                                                                                                                                                                                                                               | stale/malformed keys, malformed ICU, or source/translation runtime-contract drift passes CI                                                                                                                                                                                                                                                                                   |
 | INV15              | generator tests, `check:i18n-runtime`, package-export drift check, provider/resolver runtime-catalog tests; per-module English resolution-parity test (every key each Core module names, in every shipped locale’s fallback path, its own map versus the whole catalog); import-cost check (component bundles carry only the English they name; public paths keep the whole catalog)                                                                                                                                            | a generated module carries descriptions or is committed, a malformed entry projects instead of failing, a rich export path changes, or a `RuntimeCatalog` input is rejected or leaks a non-rich context shape, a key a module names resolves differently from the whole catalog, a component bundle carries the whole catalog, or a public path stops resolving a shipped key |
 | INV16              | build-plugin unit and real-build tests                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | a rich or generated locale import fails to resolve through the standard plugin                                                                                                                                                                                                                                                                                                |