Feature Request: Add "click-to-draw-dot" / tap support in overlay mode #7

Summary

Currently the overlay only draws when the user clicks and drags the mouse. A single click (press + release without movement) produces nothing. Many users might expect a quick left-click to place a visible dot or small mark (especially useful for highlighting or quick annotations).

Proposed Change

When the overlay is active and left mouse button is pressed:

• If the mouse moves ≥ X pixels (current behavior) → draw a continuous line
• If the mouse is released with almost no movement (< 3–5 pixels) → automatically draw a small filled circle / dot at the click position

Suggested Implementation Options

• Draw a small filled ellipse/circle (e.g. diameter = current line thickness × 2–3)
• Or draw a very short line from (down pos) to (up pos) – this automatically creates a dot when positions are nearly identical

Use Cases

• Quickly marking a single point on screen recordings or screenshots
• Highlighting a button or UI element without dragging
• Faster workflow for users who mix long strokes and single taps

Additional Polish (optional)

• Add a toggle in settings: “Single click draws dot” (on by default)
• Make dot size scale with current thickness setting

This is a tiny change but dramatically improves perceived responsiveness and usability.