feat: show the plugin icon on agent buttons

[RAIT-09]

Description

Agent buttons (the agent-client-button quick-action block) now show the plugin's identity icon — the same lucide bot-message-square used by the ribbon, chat views, and the Session Manager — to the left of the button text, so a note full of buttons makes it obvious at a glance which ones belong to Agent Client.

The change rides entirely on existing pieces: the shared LucideIcon wrapper (Obsidian's setIcon, no innerHTML) renders the icon, and the button was already inline-flex with gap: 8px, so the only CSS added is a 16px svg size rule. The icon color is deliberately unspecified — it inherits mod-cta's foreground and follows light/dark themes automatically. The icon is fixed (not a fence option): the point is recognizability, and a per-button icon: field would work against that; it remains a one-parser-field addition if ever requested.

The docs screenshot (agent-button-block.webp) is refreshed to show the new look; the options table is unchanged (no new option).

Related issue

None (UI idea from manual testing).

Type of change

• Bug fix
• New feature
• Documentation
• Refactor
• Other

Checklist

• npm run lint passes ("Use sentence case for UI text" warnings are acceptable for brand names)
• npm run build passes
• Tested in Obsidian
• Existing functionality still works
• Documentation updated if needed (screenshot refreshed)

Testing environment

• Agent: Claude Code (UI-only change). Verified: icon renders left of the text on all viewType buttons, click/autoSend behavior unchanged, light/dark themes both legible on the accent background, long button text stays vertically centered without wrapping issues
• OS: macOS

Screenshots

Summary by CodeRabbit

• New Features
  • Added a bot icon to the agent button for clearer visual identification.
  • Updated the button artwork to reflect the refreshed design.
  • Ensured the new icon displays at a consistent size and aligns correctly within the button.

[coderabbitai]

📝 Walkthrough

Walkthrough

The button block CTA now includes a leading bot icon from LucideIcon, with CSS for layout and sizing. The associated WebP image asset was replaced with new binary content.

Changes

Button block icon

Layer / File(s)	Summary
Render and style the button icon src/ui/AgentButtonBlock.tsx, styles.css	The CTA renders a bot-message-square icon before its existing text, with flex layout and 16×16 SVG sizing.
Update button block image asset docs/public/images/agent-button-block.webp	The WebP image content is replaced.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• RAIT-09/obsidian-agent-client#341: Introduced the related embeddable agent button-block UI and icon changes.

Suggested reviewers: maws7140

Poem

I’m a bunny with a bot-shaped light,
Hopping into buttons bright.
A tiny glyph now leads the way,
With sixteen pixels set to stay.
New art blooms in WebP cheer—
The agent button’s dressed this year!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly matches the main change: adding the plugin icon to agent buttons.
Description check	✅ Passed	The description follows the template well and includes the required sections, checklist, testing environment, and screenshots.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/button-block-icon

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