Bug: Desktop click() uses wrong parameter 'concept' instead of 'at' in 3 examples

[simularlyon]

Description

In examples.md, three desktop-mode click() calls incorrectly use the concept parameter (which belongs to the background browser page.click() API) instead of the correct at parameter.

The desktop click() function is documented with the at parameter in both reference.md and SKILL.md, while concept is the parameter for page.click() (background browser API).

Affected Lines

1. examples.md:205 — Extract Email Information from Gmail example:

click({concept: firstUnreadEmail});  // should be {at: firstUnreadEmail}

2. examples.md:329 — Write to Excel example:

click({concept: "cell A1"});  // should be {at: "cell A1"}

3. examples.md:337 — Write to Excel example:

click({concept: "cell A2"});  // should be {at: "cell A2"}

Expected Fix

Replace concept with at in all three desktop-mode click() calls:

- click({concept: firstUnreadEmail});
+ click({at: firstUnreadEmail});

- click({concept: "cell A1"});
+ click({at: "cell A1"});

- click({concept: "cell A2"});
+ click({at: "cell A2"});