merge: upstream v0.25.0 into lotus

Merge upstream element-hq/element-call tag v0.25.0 into the Lotus fork
(previous base: v0.20.1; actual merge-base v0.20.1-rc.1). Every Lotus
feature and all six io.lotus.* widget actions are preserved. Version
bumped to 0.25.0-lotus.1.

Conflict files and how each Lotus hunk was re-expressed:

* src/state/CallViewModel/remoteMembers/ConnectionFactory.ts
  Upstream moved echoCancellation/noiseSuppression/autoGainControl from
  constructor params (fed by URL params) to persisted Settings
  (settings.ts) with a developer-settings UI. The cinny host still drives
  these per call via URL params (noiseSuppression=false /
  autoGainControl=false when the in-source ML denoiser is active, so the
  model gets a raw mic) - taking upstream verbatim would silently break
  the ML denoise tier. Re-wired as AND semantics in generateRoomOption():
  a constraint is enabled only if BOTH the Setting and the URL param
  allow it. Params default to true, so with no params this is
  byte-for-byte upstream behaviour. Upstream's own echoCancellation /
  noiseSuppression URL params (still parsed but dead in v0.25.0) work
  again as a side effect. Lotus autoGainControl URL param kept in
  UrlParams.ts (auto-merged, unchanged).

* src/state/CallViewModel/remoteMembers/ECConnectionFactory.test.ts
  Took upstream (tests now drive via Settings). The lost Lotus coverage
  is restored in a NEW colocated file src/lotus/lotusAudioConstraints.test.ts
  (3 tests) so the upstream test file stays pristine. Verified the new
  test fails against pure-upstream ConnectionFactory and passes with the
  re-wiring.

* src/state/CallViewModel/CallViewModel.ts
  Three small hunks: kept both the Lotus `userMedia$` interface member
  and upstream's new `keyRotationSuppressed$`; dropped the three Lotus
  audio constructor args (mechanism removed upstream, see above); kept
  both in the returned object. The [lotus #4] overrideSpotlight$ routing,
  manualSpotlightUserId$ and setManualSpotlight auto-merged; verified
  against upstream's changed ringingMedia$ (now single-or-null instead
  of array) - the merge correctly took upstream's outer branch and the
  inner screenShares$/spotlightSpeaker$ logic that lotusSpotlight.ts
  mirrors is unchanged upstream.

* src/index.css
  Kept both: Lotus lotus-transparent / lotus-theme blocks and upstream's
  new body[data-background="gradient"]::before full-viewport gradient.
  The naive merge swallowed the closing brace of body.lotus-theme -
  restored. Added a rule hiding the new gradient pseudo-element under
  body.lotus-transparent, since it would otherwise paint over the
  transparent body and hide the host wallpaper.

* src/components/CallFooterViewModel.tsx, src/components/CallFooter.stories.tsx
  No Lotus content - pure upstream-vs-upstream conflicts caused by the
  merge base being v0.20.1-rc.1. Took upstream (layoutMode ->
  layoutSwitchVm; setLayoutMode removed). No Lotus code uses
  setGridMode/layoutMode.

Non-conflicting but reviewed:

* src/widget.ts auto-merged cleanly. Upstream's removal of .well-known
  transport advertisement and the new RTC-transport capability request
  did not touch the action registration loop the LOTUS_TO_WIDGET_ACTIONS
  spread and widget.lazyActions ride on - nothing to re-wire.
* src/room/InCallView.tsx, src/useAudioContext.tsx, src/useTheme.ts,
  src/tile/MediaView.tsx(+.module.css), src/UrlParams.ts(+test),
  all *.module.css and .gitea/workflows/ci.yml auto-merged; each diff
  against v0.25.0 was checked to equal the original Lotus hunk.
* src/button/Button.module.css: the merge appended an exact duplicate
  of upstream's `.rotate`/`@keyframes spin` block (rc.1 merge-base
  artefact) - reset to upstream verbatim.
* src/grid/OneOnOnePortraitLayout.module.css was renamed upstream to
  OneOnOneMobileLayout.module.css; git followed the rename and the Lotus
  safe-area PiP inset fix applies there (the --content-inset-* vars it
  uses still exist upstream).

Tooling changes inherited from upstream that affect the fork:

* eslint + prettier were replaced by oxlint + oxfmt (`pnpm lint:oxlint`,
  `pnpm format:check`). oxlint flagged 10 issues, all in src/lotus/*:
  8x no-meaningless-void-operator (dropped the `void` before void-typed
  widget transport.reply / callbacks - no behaviour change), 1x
  consistent-type-imports (lotusWidget.ts: `import type`), and 2x
  unicorn/no-useless-spread in lotusAudioInject.ts which are FALSE
  POSITIVES - `[...activeClips]` is a required defensive copy because
  abort() deletes from the Set during iteration; suppressed with an
  explanatory eslint-disable-next-line. oxfmt reformatted 7 Lotus
  touched files (whitespace only).
* packageManager bumped by upstream to pnpm@11.21.0, which requires
  Node >= 22.13 (uses node:sqlite). Node 20 cannot run it; pnpm 10.33
  cannot read the new lockfile either (matrix-js-sdk is now a git
  dependency on develop, using a version-union pnpm 10 rejects). Fork CI
  already uses Node 24 (.node-version), so CI is unaffected.
* matrix-js-sdk is now github:matrix-org/matrix-js-sdk#develop (pinned
  by commit in pnpm-lock.yaml).

Lotus behaviour NOT preserved: none found.

Verification (Node 24.11.1, pnpm 11.21.0): pnpm install --frozen-lockfile
OK (lockfile taken from upstream unchanged, no regeneration needed);
tsc clean; oxlint clean; oxfmt --check clean; knip exit 0 (2 config
hints in upstream knip.ts only); vitest unit 84 files / 627 passed /
9 skipped; build:embedded OK, staged to embedded/web/dist (44M), all
six io.lotus.* action strings present in the bundle.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/button/Button.module.css

@@ -5,10 +5,6 @@ SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
 Please see LICENSE in the repository root for full details.
 */
 
-.endCall > svg {
-  color: var(--stopgap-color-on-solid-accent);
-}
-
 .rotate > svg {
   animation: spin 1s linear infinite;
 }

src/button/Button.tsx

@@ -135,21 +135,12 @@ interface EndCallButtonProps extends ComponentPropsWithoutRef<"button"> {
   size?: "md" | "lg";
 }
 
-export const EndCallButton: FC<EndCallButtonProps> = ({
-  className,
-  ...props
-}) => {
+export const EndCallButton: FC<EndCallButtonProps> = (props) => {
   const { t } = useTranslation();
 
   return (
     <Tooltip label={t("hangup_button_label")}>
-      <CpdButton
-        className={classNames(className, styles.endCall)}
-        iconOnly
-        Icon={EndCallIcon}
-        destructive
-        {...props}
-      />
+      <CpdButton iconOnly Icon={EndCallIcon} destructive {...props} />
     </Tooltip>
   );
 };
@@ -173,7 +164,7 @@ export const LoudspeakerButton: FC<LoudspeakerButtonProps> = ({
         iconOnly
         Icon={loudspeakerModeEnabled ? VolumeOnSolidIcon : VolumeOffSolidIcon}
         {...props}
-        kind={loudspeakerModeEnabled ? "primary" : "secondary"}
+        kind={loudspeakerModeEnabled ? "secondary" : "primary"}
         aria-checked={loudspeakerModeEnabled}
       />
     </Tooltip>

src/button/__snapshots__/ReactionToggleButton.test.tsx.snap

@@ -140,7 +140,7 @@ exports[`Can raise hand 1`] = `
     aria-expanded="false"
     aria-haspopup="true"
     aria-labelledby="_r_1j_"
-    class="_button_1nw83_8 raisedButton _has-icon_1nw83_60 _icon-only_1nw83_53"
+    class="_button_1nw83_8 _raisedButton_fb25ab _has-icon_1nw83_60 _icon-only_1nw83_53"
     data-kind="primary"
     data-size="lg"
     role="button"