fix(computer-use): stop using missing is_editable_text on Linux

[bbingz]

Summary

• Linux set-value called node.is_editable_text, which is not an AT-SPI Accessible attribute and raised AttributeError before the existing attempt() guard.
• Use get_editable_text_iface + EditableText.set_text_contents (with Value iface fallback) instead.

Test plan

• On Linux with computer-use: orca computer set-value --app … --element-index n --value test on an editable field succeeds
• Code path is pure Python; no unit harness for AT-SPI in CI

Fixes #10569

[coderabbitai]

📝 Walkthrough

Walkthrough

set_value now detects editability by probing the editable-text interface directly. When available, it sets text through Atspi.EditableText. The existing value-interface fallback remains unchanged.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description includes the change summary and test plan but omits the required Screenshots, Testing, AI Review Report, Security Audit, and Notes sections.	Add all required template sections, including No visual change when applicable, test checkboxes or rationale, AI review details, security audit findings, and platform-specific notes.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The code change directly addresses issue #10569 by replacing the unavailable node.is_editable_text call with get_editable_text_iface() to detect and set editable text on Linux.
Out of Scope Changes check	✅ Passed	All changes in runtime.py are directly related to fixing the set_value function to comply with issue #10569; no out-of-scope modifications are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title clearly and concisely describes the fix for the missing Linux is_editable_text attribute.

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[bbingz]

Closing as duplicate of #10586.

#10586 already lands the same Linux get_editable_text_iface probe plus the ATSPI-stubbed set_value_test.py suite and verify-computer-native guardrails against reintroducing is_editable_text. Keeping a probe-only PR (#13562) would split review for #10569; prefer the fuller merge path.