fix: skip property_get for callable expressions during hover

[DrSAS]

Fixes #1118

Problem

When hovering over a method call like $this->compute($value) during a breakpoint, the adapter sends a property_get command. This triggers __get() on the server side, producing unwanted PHP Notices before the TypeScript catch block can intervene.

Solution

Added isHoverOnCallable() which reads the source line and checks if the hovered expression is immediately followed by parentheses. If so, the evaluate request is rejected early — no property_get is sent.

Changes

• EvaluateArgsWithSource interface for typed access to source
• isHoverOnCallable() private helper on PhpDebugSession
• Early return guard in evaluateRequest for hover context

Tested manually

Scenario	Result
Hover on method call $this->compute(...)	No PHP Notice, no side-effect
Hover on property $this->cache	Shows value (unchanged)
Hover on variable $model	Shows value (unchanged)
Hover on method name without ()	Falls back to property_get (unchanged)
Hover on method call via remote container (vscode-remote://)	No PHP Notice, no side-effect