docs: update documentation for OpenHands v1.23.0

[all-hands-bot]

Source issue: #828

Summary of documentation changes

Documents the user-facing changes in OpenHands v1.23.0:

• openhands/usage/agent-canvas/setup.mdx — Replaces the Apple-silicon-only macOS install instructions with the new universal Agent-Canvas-<version>-universal.dmg, which runs on both Apple silicon and Intel Macs with bundled per-architecture uv/Node.js runtimes. Removes the "use the npm or from-source method on an Intel Mac" guidance (#17225).
• openhands/usage/agent-canvas/customize-and-settings.mdx — Adds a Color Theme setting under Settings > Application and lists the new Light+ and Solarized Light light themes (#16632).
• openhands/usage/agent-canvas/managing-automations.mdx — Adds a "Script Automation Run Logs" section describing run logs for script (bundle) automations on cloud backends, the No conversation — this run executed a script. Use View logs for its output. message, and the automation detail view's Script section (#17519).
• openhands/usage/agent-canvas/conversations.mdx — Updates the tag-chip description to the Key: value format (for example Artifacts: 1) and notes that a stale "Failed to send" bubble clears automatically once the server confirms the message (#16853, #17639).
• openhands/usage/agent-canvas/release-notes/v1.23.0.mdx (new) and docs.json — Adds the v1.23.0 Agent Canvas release-notes page and registers it in the Release Notes nav group.

Validation performed

• python3 -c "import json; json.load(open('docs.json'))" — docs.json parses successfully.
• uv run --with pytest --with requests --with pyyaml pytest -q tests/ — 35 passed, 2 pre-existing errors in tests/test_pricing_documentation.py unrelated to this change (they fetch https://raw.githubusercontent.com/OpenHands/OpenHands/main/openhands/utils/llm.py, which returns 404).
• Internal anchors referenced by the new release-notes page were checked against the headings in conversations.mdx, managing-automations.mdx, customize-and-settings.mdx, and setup.mdx.

Not run: mint broken-links (the mintlify CLI is not installed in this environment).

Notes for reviewers

• The exact settings label and path for the color theme should be confirmed with a maintainer. The change records the label Color Theme and the Settings > Application page, consistent with the existing app settings page and available translations.
• Human verification of the themes, the universal macOS DMG, script-automation run logs, tag chips, and the failed-send bubble is still required. See the source issue for concrete scenarios.

This pull request was created by an AI agent (OpenHands) on behalf of the user.

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