[Bug]: Custom speed rejects the "×" suffix that Custom zoom accepts #1441

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Describe the bug

When entering a Custom speed in the editor with a trailing x or × (e.g. 1.25x, 1.5×), the input is rejected and silently reverts to the previous value on blur/Enter. Without the suffix, 1.25 is accepted and applied correctly.

The Custom zoom input in the same inspector accepts both plain decimals (1.25) and multiplier-suffixed values (1.25x, 1.25×). The Custom speed field's own placeholder shows its value in that form (2×), so the field invites input it then rejects.

Cause: parseCustomPlaybackSpeedInput in src/components/video-editor/customPlaybackSpeed.ts passes the draft straight to Number(), so a trailing x/× gives NaN and the draft is discarded. The zoom field in FloatingInspector.tsx strips a trailing /\s*[×x]$/i before parsing.

Regression history: in v1.7.0 the speed parser stripped non-numeric characters, so 1.25x worked. Commit 59df3544 ("refactor: shrink YAGNI signatures", described as "no behavior change") replaced that with Number() (first released in v1.8.0). The tests updated in that commit covered 1.2.3 and comma decimals; the suffix was never tested. Still present on main as of 2026-10-31.

I'd like to submit a small fix with unit tests and will open a PR that links this issue.

Expected behavior

Custom speed should accept multiplier suffixes like 1.25x or 1.25×, matching the field's own placeholder (2×, 1.5×) and the Custom zoom field.

To Reproduce

1. Add/select a speed region and open the Speed panel.
2. Type 1.25x (or 1.25×) in Custom speed.
3. Press Enter or click away.
4. The field returns to the old value (2× in the recording), and the pill/playback do not change.
5. Compare with Custom zoom: the same 1.25x input is accepted there.

Screenshots

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OS

Linux

OS Version

Fedora 44 (Gnome 50.6)

Other OS

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Browser

None

Browser Version

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Other Browser

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Device Type

Laptop

Other Device

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Additional context

OpenScreen 2.1.2 (Electron 41.2.1, Chromium 146.0.7680.188, Node 24.14.1), Linux x64.