Add element_name parameter to Click-Tool and Move-Tool

[ikoskela]

Summary

• Adds optional element_name and window_title parameters to Click-Tool and Move-Tool
• When element_name is provided, uses Windows UI Automation to find the element by its accessible name and click/move to its center coordinates — no coordinate estimation needed
• window_title optionally scopes the search to a specific window (substring match)
• Fully backward-compatible: existing loc-based calls work unchanged

Motivation

Currently, clicking a UI element requires the caller to estimate coordinates — either from State-Tool output, screenshots, or manual calculation. This is error-prone, especially on high-DPI displays where coordinate systems can be mismatched.

UI Automation can locate elements precisely by name, returning exact bounding rectangles. This PR exposes that capability directly in Click-Tool and Move-Tool, so callers can say click(element_name="Save") instead of guessing pixel coordinates.

Implementation

• Adds _resolve_element_location() helper that uses the existing windows_mcp.uia module (no new dependencies)
• Uses uia.Control(Name=...) for element search with Exists(maxSearchSeconds=3) timeout
• Uses uia.WindowControl(SubName=...) for optional window scoping
• Returns center coordinates from BoundingRectangle — ready for pyautogui
• Clear error messages when element or window is not found

Examples

# Click a button by name
click_tool(element_name="Save")

# Click within a specific window
click_tool(element_name="Submit", window_title="Settings")

# Move to an element
move_tool(element_name="Close", window_title="Notepad")

# Existing coordinate-based calls still work
click_tool(loc=[500, 300])

Test plan

• Verify click_tool(loc=[x, y]) still works as before
• Verify click_tool(element_name="Start") finds and clicks the Start button
• Verify click_tool(element_name="Nonexistent") returns a clear error
• Verify window_title scoping works correctly
• Verify move_tool with element_name moves cursor to the element