feat: add cursor-interactive element detection in snapshots (#374)

* fix: only warn about ignored flags when explicitly passed via CLI

The warning about launch-time options being ignored (when daemon is
already running) was incorrectly shown when options were set via
environment variables like AGENT_BROWSER_EXECUTABLE_PATH, even when
no CLI flag was passed.

Now the warning only appears when flags are explicitly passed on the
command line, not when values come solely from environment variables.

Fixes #372

* feat: add cursor-interactive element detection in snapshots

Add -C/--cursor flag to snapshot command that detects clickable elements
that don't have proper ARIA roles but are interactive based on:
- cursor: pointer CSS style
- onclick attribute/handler
- tabindex attribute

This helps with modern web apps that use custom divs/spans as buttons.

Fixes #366

* fix: add cursor option to getSnapshot type signature

README.md

@@ -302,6 +302,7 @@ The `snapshot` command supports filtering to reduce output size:
 ```bash
 agent-browser snapshot                    # Full accessibility tree
 agent-browser snapshot -i                 # Interactive elements only (buttons, inputs, links)
+agent-browser snapshot -i -C              # Include cursor-interactive elements (divs with onclick, etc.)
 agent-browser snapshot -c                 # Compact (remove empty structural elements)
 agent-browser snapshot -d 3               # Limit depth to 3 levels
 agent-browser snapshot -s "#main"         # Scope to CSS selector
@@ -311,10 +312,13 @@ agent-browser snapshot -i -c -d 5         # Combine options
 | Option | Description |
 |--------|-------------|
 | `-i, --interactive` | Only show interactive elements (buttons, links, inputs) |
+| `-C, --cursor` | Include cursor-interactive elements (cursor:pointer, onclick, tabindex) |
 | `-c, --compact` | Remove empty structural elements |
 | `-d, --depth <n>` | Limit tree depth |
 | `-s, --selector <sel>` | Scope to CSS selector |
 
+The `-C` flag is useful for modern web apps that use custom clickable elements (divs, spans) instead of standard buttons/links.
+
 ## Options
 
 | Option | Description |