Update react monorepo to v19 (major) (#28914)

* Update react monorepo to v19

* Import JSX explicitly for React 19 compatibility

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update usages of refs for React 19 compatibility

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update react imports

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Avoid legacy contexts as much as possible

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Avoid deprecated React symbols

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Stash

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Update usages of refs for React 19 compatibility

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Switch pillify to use a html-react-parser approach rather than DOM muddling

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate react html parsing

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate react html parsing

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate html parsing

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Memoize the EventContentBody component

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate html parsing

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Simplify

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Discard changes to src/Linkify.tsx

* Discard changes to src/components/views/messages/TextualBody.tsx

* Discard changes to src/settings/handlers/AbstractLocalStorageSettingsHandler.ts

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Prepare for React 19 upgrade

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Remove stale comment

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

---------

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

playwright/e2e/regression-tests/pills-click-in-app.spec.ts

@@ -43,6 +43,7 @@ test.describe("Pills", () => {
 
         // go back to the message room and try to click on the pill text, as a user would
         await app.viewRoomByName(messageRoom);
+        await expect(page).toHaveURL(new RegExp(`/#/room/${messageRoomId}`));
         const pillText = page.locator(".mx_EventTile_body .mx_Pill .mx_Pill_text");
         await expect(pillText).toHaveCSS("pointer-events", "none");
         await pillText.click({ force: true }); // force is to ensure we bypass pointer-events