Feature: Time info overlay (current/end time, wall-clock finish time, custom format)

[sushantadhkr]

PRs are disabled on this repo, so posting this as an issue instead — happy to share the diff/patch if useful, or a fork link.

What it does

Adds an optional overlay shown on top of the video (or pinned to a fixed screen corner) displaying:

• Current/total time, scaled to playback speed (e.g. at 2x, a 30:20 video shows as 15:10)
• The wall-clock time the video will finish (e.g. "2:08 PM"), accounting for current speed
• Optional remaining-time countdown
• A custom format string option, e.g. "Ends at {{clock}} ({{remaining}})"

Related to #335 (Show saved time and new duration time at current speed) — this covers that request plus a live end-clock time.

Settings

• Toggle in Section Flags: "Show time info"
• Modal with: placement (fixed on screen vs. anchored to the video), corner position, opacity, font size, rounding, offset, color (defaults to theme, overridable), 12/24/auto clock format, show/hide toggles for each part, custom format string, hide-in-fullscreen, and a zoom-compensation toggle so the overlay's size stays consistent regardless of browser zoom
• Overlay auto-hides on mouse hover so it doesn't block native player controls underneath

Why

Useful for knowing exactly when a video/lecture/podcast will finish in real time, especially at non-1x speeds where the native duration display is misleading.

Happy to clean this up into a proper patch/branch on my fork if you'd want to merge it — let me know your preferred format since PRs are off. Fork: https://github.com/wormcracker/globalSpeed