style: render custom agent sections like presets

[RAIT-09]

Description

Custom agents in the settings tab were still wrapped in a card (background, border, rounded corners) — a leftover from before the collapsible agent sections (#350), when custom agent settings were a flat list and the card was the only thing marking where one agent ended and the next began. Since #350 the summary rows mark those boundaries themselves, so the card had become a double border; the CSS even carried a correction rule (border-top: none inside the card) to hide the doubling.

• Drop the card: renderCustomAgent no longer creates the agent-client-custom-agent wrapper and renders the collapsible section directly, exactly like renderPresetSettings. Both card CSS rules (the card itself and the border-top correction) are deleted with it — the class is now referenced nowhere (grep-verified). Custom agents render identically to presets: summary rows separated by thin rules.
• Label the "Add custom agent" row: with the card gone, the bare-button setting row stood out in themes that box every setting item (it rendered as an empty card with a lone button). Instead of fighting the theme with CSS, the row now has a name ("New custom agent") and description, so it reads like every other setting row in any theme. The button label is unchanged (docs reference it).

No behavior change: section open/collapse state, the Enabled toggle, and the delete button all live in the summary row and are untouched.

Related issue

None.

Type of change

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

Checklist

• npm run lint passes ("Use sentence case for UI text" errors are acceptable for brand names)
• npm run build passes
• Tested in Obsidian
• Existing functionality still works
• Documentation updated if needed (button label unchanged, so the custom-agents setup steps stay accurate)

Testing environment

• Agent: N/A (settings tab layout only — no agent runtime change). Verified: sections render like presets, open/collapse + Enabled toggle + delete work, adding an agent opens its new section, empty state intact, light/dark themes checked
• OS: macOS

Screenshots

Summary by CodeRabbit

• User Interface
  • Improved the labeling and description of the “New custom agent” setting for clearer setup.
  • Updated custom agent sections for a more consistent layout with other agent settings.
  • Simplified custom agent styling and removed the documentation link hover underline.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 6a327bee-da27-4940-a5d0-5e22e9d9a9c5

📥 Commits

Reviewing files that changed from the base of the PR and between 28a4265 and 8b2e08d.

📒 Files selected for processing (2)

• src/ui/SettingsTab.ts
• styles.css

💤 Files with no reviewable changes (1)

• styles.css

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📝 Walkthrough

Walkthrough

The custom-agent settings UI now uses a named and described creation control, renders collapsible agent sections directly in their parent container, and removes obsolete custom-agent and documentation-link hover styling.

Changes

Custom agent settings

Layer / File(s)	Summary
Custom agent rendering and styling src/ui/SettingsTab.ts, styles.css	The new-agent action now uses an explicitly named and described setting while preserving its creation flow. Custom-agent sections render directly into the parent container, and obsolete wrapper-specific CSS and documentation-link hover styling are removed.

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

Possibly related PRs

• RAIT-09/obsidian-agent-client#350: Introduced the collapsible custom-agent section structure updated here.
• RAIT-09/obsidian-agent-client#349: Also modifies custom-agent UI behavior in SettingsTab.ts.
• RAIT-09/obsidian-agent-client#357: Refactors custom-agent rendering and re-render call sites.

Suggested reviewers: donivatamazondotcom

Poem

A rabbit hops through settings bright,
Labels the button just right.
Old borders fade, wrappers flee,
Agents unfold naturally.
“Binky!” says the bunny with glee.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and clearly summarizes the main change: rendering custom agent sections like presets.
Description check	✅ Passed	The description matches the template well, covering the change, issue status, change type, checklist, testing, and screenshots.
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.

✨ 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 style/drop-custom-agent-card

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