fix(cli): honor AGENT_BROWSER_DEFAULT_TIMEOUT env var for wait commands (#1153)

* fix(cli): honor AGENT_BROWSER_DEFAULT_TIMEOUT env var for wait commands

The `AGENT_BROWSER_DEFAULT_TIMEOUT` environment variable was being ignored by CLI wait commands, causing them to use hardcoded 30-second timeouts instead of the configured default.

## Changes Made

- **Centralized timeout injection**: Modified `parse_command()` to automatically inject `flags.default_timeout` into any wait-family command that doesn't already have an explicit `--timeout` flag
- **Environment variable parsing**: Added `default_timeout` field to `Flags` struct that reads from `AGENT_BROWSER_DEFAULT_TIMEOUT` env var
- **Daemon propagation**: Updated daemon spawning to pass through the default timeout via environment variables
- **Unified timeout handling**: Added `timeout_ms()` helper method in `DaemonState` that all wait handlers now use instead of scattered `unwrap_or()` calls
- **Comprehensive test coverage**: Added 10 regression tests covering all wait command variants and edge cases

## Implementation Details

The fix uses a two-stage approach:
1. CLI parses the env var and injects timeout values into command JSON for any `wait*` action
2. Daemon reads the env var and provides a centralized fallback via `timeout_ms()` helper

This ensures new wait variants automatically inherit the default timeout without requiring per-variant wiring.

Fixes #1147

* fix: preserve 30s default timeout for backward compatibility

The default_timeout_ms fallback was set to 25_000ms, which silently
changes the existing 30_000ms behavior for users who haven't set
AGENT_BROWSER_DEFAULT_TIMEOUT. Restore the original 30s default.

---------

Co-authored-by: ctate <366502+ctate@users.noreply.github.com>

cli/src/main.rs

@@ -826,6 +826,7 @@ fn main() {
         engine: flags.engine.as_deref(),
         auto_connect: flags.auto_connect,
         idle_timeout: flags.idle_timeout.as_deref(),
+        default_timeout: flags.default_timeout,
         cdp: flags.cdp.as_deref(),
         no_auto_dialog: flags.no_auto_dialog,
     };