Fix Android IME input and tmux clipboard copying

[bifrost0x]

Summary

• reset stale xterm helper input before Android IME composition starts, preventing duplicated display text and truncated committed input
• accept bounded, strict UTF-8 OSC 52 clipboard updates only for confirmed persistent tmux sessions
• keep plain SSH sessions isolated from remote OSC 52 clipboard writes and leave remote tmux configuration unchanged
• document the persistent-tmux clipboard behavior and browser permission boundary

Validation

• node --test tests/js/*.test.js (38/38 test files passed)
• playwright test tests/e2e/session-workspace.spec.js (20/20 passed)
• pytest -q (2,352 passed, 29 skipped; four loopback tests rerun with socket access)
• eslint static/js
• vendored frontend asset check
• authentication i18n generated-file check
• git diff --check

Closes #196
Closes #197

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-04T03:51:57.587156Z	32f4b5b	Manual request

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💡 Codex Review

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Reviewed commit: 3bb176e3de

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Reviewed commit: c00348ef2b

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Codex Review: Didn't find any major issues. Delightful!

Reviewed commit: 32f4b5b92f

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