Omaframe 0.10.0

Omaframe now takes delayed screenshots, keeps a capture history, snaps marks
with Shift, and shows microphone and computer sound levels.

• Delay timer. Press Shift+Print, or the Delay button (3, 5 or 10
  seconds), or press T in the selector to start a countdown, so menus,
  tooltips and hover states stay open. omaframe --delay N (0 to 30 seconds)
  does the same from a key or script. A small badge shows "Screenshot in N"
  with Cancel. The last choice is remembered, and plain Print Screen stays
  immediate.
• Capture history. Press Ctrl+H, run omaframe --history, or use the
  launcher to list saved screenshots, recordings, exports and drafts, by day.
  Each row can copy, open in the editor, reveal, resume or move a file to the
  Trash. History only lists files you saved and keeps no extra copies.
• Angle snapping. Hold Shift while drawing to snap arrows and lines to 45
  degree steps and turn boxes, highlights, redactions and blurs into squares
  and ovals into circles. A small readout shows while Shift is held, and it is
  never exported.
• Sound meters. In video mode the Sound and Mic buttons show a live level
  before and during a recording, and Options shows device names, levels, peaks
  and clip warnings. The meters read the exact inputs handed to the recorder.

Open now uses your system file chooser, the same one your other apps show,
and starts in your screenshot folder or the last folder you opened from.
Without a desktop portal, a larger built-in dialog opens instead.

Recordings are written to a hidden file until they finish. A failed or
force-stopped recording that is kept shows as Incomplete, and a recording left
over from a crash is recovered as Incomplete on the next start.

Fixes

• Clicking Copy and save while finishing a label no longer does nothing.
• Pasted and duplicated marks stay inside the crop.
• Long pen strokes are resampled, so nothing after point 2048 is lost.
• Hiding a secret needs a full redaction; partial covers and blur no longer
  count.
• If a draft cannot be saved, the work is kept open with retry or discard.
• A stuck recorder can be force-stopped after 15 seconds, keeping the partial
  file, and recorder failures use plain messages instead of raw log output.
• Export ffmpeg stops with Omaframe, and abandoned export temp files are
  cleaned up on start.
• Losing the camera during the countdown is reported, and a saved camera that
  is not connected says so instead of switching.
• Scrolling capture keeps at most 400 MiB of retained frames.
• Turning on another shortcut never regenerates a key you bound yourself.
• WebP support is added through qt6-imageformats.

Thanks to @sonlndv for selecting a box by clicking inside it (#27).

Validated with all seventeen headless suites, a real PulseAudio test and the
OCR pattern tests, and on a two monitor Omarchy desktop at 1.25 scale with a
real microphone. Bluetooth headsets and physical cameras were not tested.

Update through omarchy update or sudo pacman -Syu, then reopen Omaframe.
Existing captures, settings and drafts are preserved.