Improve SplitButton sample (#7805)

[deleonio]

Summary

• simplify SplitButton samples
• demonstrate vertical toolbar actions

Testing

• pnpm format -w
• pnpm lint
• pnpm test (fails: Neither environment variable RUNNER_TEMP or TMPDIR specified)

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https://chatgpt.com/codex/tasks/task_e_687869e8bb44832b92f9816337b0c7fe

[github-actions]

Netlify Draft Deployment
URL: https://687896d93707ee48d8ce0cd6--kolibri-public-ui.netlify.app
Logs: https://app.netlify.com/projects/kolibri-public-ui/deploys/687896d93707ee48d8ce0cd6

[github-actions]

Hydration Benchmark Report (vs Baseline)

✅ Top 5 Improvements (Best Speedups)

Component	Current	Baseline	Δ%	Result
kol-select	80ms	117.1ms	-31.7%	✅
kol-avatar	22.8ms	26.9ms	-15.2%	✅
kol-table-stateless	386.2ms	437ms	-11.6%	✅
kol-input-radio	50.2ms	56.5ms	-11.2%	✅
kol-form	32.2ms	35.6ms	-9.6%	➖

🔻 Flop 5 Regressions (Worst Slowdowns)

Component	Current	Baseline	Δ%	Result
kol-drawer	45.4ms	25.6ms	+77.3%	🔻
kol-card	33.7ms	22.6ms	+49.1%	🔻
kol-input-number	65.8ms	56.1ms	+17.3%	🔻
kol-input-password	59.7ms	51.6ms	+15.7%	🔻
kol-button-link	58.1ms	50.7ms	+14.6%	🔻

📋 Show all results

Component	Current	Baseline	Δ%	Result
kol-abbr	19.5ms	19.8ms	-1.5%	➖
kol-accordion	137.4ms	131ms	+4.9%	➖
kol-alert	119.4ms	105.9ms	+12.7%	🔻
kol-avatar	22.8ms	26.9ms	-15.2%	✅
kol-badge	66.1ms	70.1ms	-5.7%	➖
kol-breadcrumb	97.3ms	97.6ms	-0.3%	➖
kol-button	59.4ms	63ms	-5.7%	➖
kol-button-link	58.1ms	50.7ms	+14.6%	🔻
kol-card	33.7ms	22.6ms	+49.1%	🔻
kol-details	146.1ms	134.9ms	+8.3%	➖
kol-drawer	45.4ms	25.6ms	+77.3%	🔻
kol-form	32.2ms	35.6ms	-9.6%	➖
kol-heading	21.3ms	21.5ms	-0.9%	➖
kol-icon	68.6ms	65.1ms	+5.4%	➖
kol-image	18.4ms	19.3ms	-4.7%	➖
kol-input-checkbox	140.5ms	141.3ms	-0.6%	➖
kol-input-color	84.6ms	81.9ms	+3.3%	➖
kol-input-date	72.1ms	70.3ms	+2.6%	➖
kol-input-email	61.2ms	62.5ms	-2.1%	➖
kol-input-file	102.5ms	93.7ms	+9.4%	➖
kol-input-number	65.8ms	56.1ms	+17.3%	🔻
kol-input-password	59.7ms	51.6ms	+15.7%	🔻
kol-input-radio	50.2ms	56.5ms	-11.2%	✅
kol-input-text	64.1ms	59.3ms	+8.1%	➖
kol-link	54.5ms	49.8ms	+9.4%	➖
kol-link-button	60.8ms	56.5ms	+7.6%	➖
kol-modal	21.7ms	20.5ms	+5.9%	➖
kol-nav	32.2ms	33.9ms	-5%	➖
kol-pagination	453.5ms	423.8ms	+7%	➖
kol-popover-button	74ms	71.3ms	+3.8%	➖
kol-progress	33.2ms	32.8ms	+1.2%	➖
kol-quote	19.4ms	19ms	+2.1%	➖
kol-select	80ms	117.1ms	-31.7%	✅
kol-skip-nav	21.5ms	23.6ms	-8.9%	➖
kol-spin	23.8ms	24.2ms	-1.7%	➖
kol-split-button	173.8ms	174.7ms	-0.5%	➖
kol-table-stateful	368.9ms	374.7ms	-1.5%	➖
kol-table-stateless	386.2ms	437ms	-11.6%	✅
kol-tabs	30.4ms	32.3ms	-5.9%	➖
kol-textarea	53.2ms	54.1ms	-1.7%	➖
kol-toolbar	35.2ms	36ms	-2.2%	➖
kol-tree	29.5ms	26.5ms	+11.3%	🔻
kol-tree-item	68.2ms	64ms	+6.6%	➖
kol-version	156.2ms	154.8ms	+0.9%	➖