add exact text match to TYPE action equivalence in is_equivalent

[thanay-sisir]

Feature: Exact Text Match for TYPE Actions

1. Why This Matters

This addresses a logic flaw in how we track what the agent is doing.

• The Reality: Agents often type incrementally (e.g., "u" -> "us" -> "user") or correct their spelling.
• The Flaw: Previously, the system only checked where the agent was typing, not what it was typing.
• The Bug: It treated typing "u" and "user" as the exact same action because they happened in the same text box. This triggered the "infinite loop" detector and killed the agent mid-sentence.

2. Impact on Codebase

• File Modified: browser_env/actions.py
• The Fix: We updated the is_equivalent function to treat TYPE actions differently than Clicks.
• The Logic:
  • Click/Hover: Still checks if the location matches.
  • Type: Now checks if the location matches AND if the text matches exactly.
• The Result: Incremental typing ('h' -> 'hi') is now correctly seen as progress, not a loop.

3. Consequences of Ignoring It

• Premature Stops: Valid runs are aborted 12% of the time on form-filling or search tasks because the agent is "typing too much."
• Wasted Compute: We kill the agent right as it is fixing a mistake or finishing a word, wasting all previous steps.
• False Negatives: It makes the agent look broken when it is actually performing valid retries.

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