fix input clear fallbacks and clarify clear-then-type behavior

[laithrw]

Resolves #4683

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Summary by cubic

Fixes input clearing so we don’t stop on JS clear failures, and clarifies “clear-then-type” as the default. Adds a clear-only option via text="" and a way to append via clear=False. Resolves #4683.

• Bug Fixes
  • Removed premature returns in JS clear to enable fallback strategies.
  • Aligned docs and help to the default behavior: clear-then-type; text="" clears only; clear=False appends (browser_type tool, InputTextAction schema, CLI input, SKILL.md).

^{Written for commit 4476f6e. Summary will update on new commits.}

[github-actions]

Agent Task Evaluation Results: 2/2 (100%)

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Task	Result	Reason
amazon_laptop	✅ Pass	Skipped - API key not available (fork PR or missing secret)
browser_use_pip	✅ Pass	Skipped - API key not available (fork PR or missing secret)

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[cubic-dev-ai]

No issues found across 6 files