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/tile/MediaView.module.css

@@ -27,8 +27,15 @@ Please see LICENSE in the repository root for full details.
   transform: translate(0);
 }
 
+.media[data-video-enabled="false"] video {
+  display: none;
+}
+
 .media.mirror video {
   transform: scaleX(-1);
+  /* In FF if you add a transform: scale/translate/matrix filter on an element,
+  it'll ignore the parents' border-radius, so force back the radius to avoid UI glitch*/
+  border-radius: inherit;
 }
 
 .media[data-video-fit="cover"] video {
@@ -41,24 +48,76 @@ Please see LICENSE in the repository root for full details.
 
 .bg {
   grid-area: content;
-  background-color: var(--video-tile-background);
   inline-size: 100%;
   block-size: 100%;
   border-radius: inherit;
   contain: strict;
 }
 
+.media[data-background="solid"] .bg {
+  background-color: var(--video-tile-background);
+}
+
+.waves {
+  transition: opacity ease 0.3s;
+}
+
+.waves[data-visible="true"] {
+  opacity: 1;
+}
+
+.waves[data-visible="false"] {
+  opacity: 0;
+
+  @media not (prefers-reduced-motion) {
+    .wave {
+      transform: translate(-50%, -50%) scale(0.9);
+    }
+  }
+}
+
+.wave {
+  border: var(--cpd-border-width-1) solid var(--cpd-color-alpha-gray-300);
+  transition: transform ease 0.2s;
+}
+
+.wave,
+.speakingBorder {
+  border-radius: var(--cpd-radius-pill-effect);
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+}
+
+.speakingBorder {
+  background:
+    radial-gradient(#0467dd, #0bc491),
+    linear-gradient(0deg, #0467dd 0%, #0bc491 100%);
+  background-blend-mode: overlay, normal;
+  outline: var(--cpd-border-width-4) solid var(--cpd-color-bg-canvas-default);
+
+  &::after {
+    content: "";
+    position: absolute;
+    inset: var(--cpd-border-width-2);
+    border-radius: var(--cpd-radius-pill-effect);
+    background: var(--cpd-color-bg-canvas-default);
+  }
+}
+
 .avatar {
   position: absolute;
   top: 50%;
   left: 50%;
   transform: translate(-50%, -50%);
   pointer-events: none;
+  opacity: 100%;
+  transition: opacity 0.2s;
 }
 
-.translucent {
+.avatar[data-style="translucent"] {
   opacity: 50%;
-  mix-blend-mode: multiply;
 }
 
 /* [lotus #6] Profile decoration overlaid on the tile avatar. Shares the
@@ -87,6 +146,35 @@ unconditionally select the container so we can use cqmin units */
     inline-size: 50cqmin;
     block-size: 50cqmin;
   }
+
+  .waves + .avatar {
+    /* Make the avatar slightly smaller to accommodate sound waves, if present */
+    inline-size: 38cqmin;
+    block-size: 38cqmin;
+  }
+
+  .wave:nth-child(1) {
+    inline-size: calc(38cqmin + var(--cpd-space-5x) + 3 * var(--cpd-space-10x));
+    block-size: calc(38cqmin + var(--cpd-space-5x) + 3 * var(--cpd-space-10x));
+    background: var(--cpd-color-alpha-gray-200);
+  }
+
+  .wave:nth-child(2) {
+    inline-size: calc(38cqmin + var(--cpd-space-5x) + 2 * var(--cpd-space-10x));
+    block-size: calc(38cqmin + var(--cpd-space-5x) + 2 * var(--cpd-space-10x));
+    background: var(--cpd-color-alpha-gray-300);
+  }
+
+  .wave:nth-child(3) {
+    inline-size: calc(38cqmin + var(--cpd-space-5x) + var(--cpd-space-10x));
+    block-size: calc(38cqmin + var(--cpd-space-5x) + var(--cpd-space-10x));
+    background: var(--cpd-color-alpha-gray-400);
+  }
+
+  .speakingBorder {
+    inline-size: calc(38cqmin + var(--cpd-space-3x));
+    block-size: calc(38cqmin + var(--cpd-space-3x));
+  }
 }
 
 .avatar > img {
@@ -139,18 +227,18 @@ unconditionally select the container so we can use cqmin units */
 .status {
   grid-area: status;
   color: var(--cpd-color-text-primary);
-  display: flex;
-  flex-wrap: none;
-  align-items: center;
-  gap: 3px;
   user-select: none;
   overflow: hidden;
   margin-block-start: calc(var(--cpd-space-3x) - var(--fg-inset));
   margin-inline-start: calc(var(--cpd-space-4x) - var(--fg-inset));
-}
 
-.status svg {
-  color: var(--cpd-color-icon-tertiary);
+  svg {
+    color: var(--cpd-color-icon-tertiary);
+    vertical-align: text-bottom;
+    margin-inline-end: 3px;
+    block-size: 1.2em;
+    inline-size: 1.2em;
+  }
 }
 
 .reactions {