UI layout (PlayCanvas + play/page.tsx):
- "F · 全 · 屏" button (renamed from 演 · 示 to match what users
actually mean by F) floats above the canvas, right-aligned, via a
new `aboveCanvas` ReactNode slot that lives on the relative
inline-block image wrapper at `bottom-full right-0`. It hugs the
actual image right edge regardless of aspect ratio.
- "有 · 声 / 静 · 音" button mirrors that on the left via a new
`aboveCanvasLeft` slot.
- Both slots also render inside the loading placeholder so the two
controls appear from frame one, before the scene image arrives.
- InfiPlot back-link grows from 15px to 22/26px (mobile/desktop) with
a slightly larger arrow, matching the brand'\''s presence on the
homepage hero.
- Canvas-bottom metadata row (image dims on left, tutorial hint on
right) dropped. The "—" placeholder and "···" loading state looked
like stray punctuation; users found them noisy.
- Footer collapses to a single centered "Ⅰ · Ⅰ" mark.
Audio gating logic (play/page.tsx):
- Collapse the two-flag audio gate into one source of truth. The
homepage "语音配音" choice no longer lives in a separate
`audioEnabledRef` flag that gates `fetchBeatAudio` independently
of the in-page mute state. Instead the `muted` useState lazy
initializer reads `sessionStorage["infiplot:custom"].audioEnabled`
and projects it inversely (audioEnabled=false → muted=true) so
the 静音/有声 button correctly reflects the homepage selection
from the first frame. The in-page toggle remains the source of
truth from then on (persisted to localStorage:infiplot:muted).
- This fixes a visible disconnect where picking "关闭" on the
homepage left the play page showing 有声 because the in-page
state had no link to the homepage choice.
- The sessionStorage read uses the renamed key "infiplot:custom"
(the infiplot rename PR changed it from yume:custom on the home
side but the play side hadn'\''t been updated to match).
No new TTS quota is ever burned while muted: fetchBeatAudio'\''s
mutedRef.current early-return is the only path to /api/beat-audio
and is checked before the fetch fires; mute transitions also abort
in-flight requests.
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