feat: enhance tooltip animations with custom tooltip delay and duration property + samples

[deleonio]

Summary

• unify tooltip transition to use a single duration variable
• rename keyframe to fadeOpacity
• document the custom property in the tooltip README
• update sample code for custom tooltip duration

Fixes #7259

The A11y and PO reviews will only take place after all other DoD steps have been completed by the Developer:

• Meaningful pull request title for the release notes
• Pull request is linked to an issue and all changes relate to the issue
• Tests to protect this code implemented (if applicable)
• Manual test performed successfully (if applicable)
• Documentation or migration has been updated (if applicable)

[github-actions]

Netlify Draft Deployment
URL: https://6858de5f5e51ac65bc207f06--kolibri-public-ui.netlify.app
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[github-actions]

Hydration Benchmark Report (vs Baseline)

✅ Top 5 Improvements (Best Speedups)

Component	Current	Baseline	Δ%	Result
kol-logo	26.6ms	31.6ms	-15.8%	✅
kol-abbr	25.3ms	29.1ms	-13.1%	✅
kol-popover-button	77.6ms	89.2ms	-13%	✅
kol-modal	20.8ms	23.5ms	-11.5%	✅
kol-details	146.3ms	159.9ms	-8.5%	➖

🔻 Flop 5 Regressions (Worst Slowdowns)

Component	Current	Baseline	Δ%	Result
kol-button-group	26.1ms	20.3ms	+28.6%	🔻
kol-drawer	25.8ms	21.4ms	+20.6%	🔻
kol-indented-text	25.6ms	21.4ms	+19.6%	🔻
kol-heading	29ms	26ms	+11.5%	🔻
kol-avatar	25.6ms	23.2ms	+10.3%	🔻

📋 Show all results

Component	Current	Baseline	Δ%	Result
kol-abbr	25.3ms	29.1ms	-13.1%	✅
kol-accordion	153.9ms	158.2ms	-2.7%	➖
kol-alert	111ms	113.7ms	-2.4%	➖
kol-avatar	25.6ms	23.2ms	+10.3%	🔻
kol-badge	77.3ms	75.1ms	+2.9%	➖
kol-breadcrumb	92.9ms	93.6ms	-0.7%	➖
kol-button	73.8ms	77.7ms	-5%	➖
kol-button-group	26.1ms	20.3ms	+28.6%	🔻
kol-button-link	65.3ms	62.3ms	+4.8%	➖
kol-card	34.2ms	31.1ms	+10%	➖
kol-details	146.3ms	159.9ms	-8.5%	➖
kol-drawer	25.8ms	21.4ms	+20.6%	🔻
kol-form	34.3ms	37.2ms	-7.8%	➖
kol-heading	29ms	26ms	+11.5%	🔻
kol-icon	64.5ms	68.5ms	-5.8%	➖
kol-image	18.6ms	20.1ms	-7.5%	➖
kol-indented-text	25.6ms	21.4ms	+19.6%	🔻
kol-input-checkbox	148.6ms	148.7ms	-0.1%	➖
kol-input-color	68.5ms	72.8ms	-5.9%	➖
kol-input-date	74ms	75.1ms	-1.5%	➖
kol-input-email	68.2ms	73.2ms	-6.8%	➖
kol-input-file	65.4ms	66.6ms	-1.8%	➖
kol-input-number	69.7ms	72.7ms	-4.1%	➖
kol-input-password	67.8ms	71.1ms	-4.6%	➖
kol-input-radio	51.1ms	52.4ms	-2.5%	➖
kol-input-text	70ms	74.8ms	-6.4%	➖
kol-link	67.1ms	66.2ms	+1.4%	➖
kol-link-button	73.5ms	72.9ms	+0.8%	➖
kol-link-group	24.5ms	22.3ms	+9.9%	➖
kol-logo	26.6ms	31.6ms	-15.8%	✅
kol-modal	20.8ms	23.5ms	-11.5%	✅
kol-nav	29.9ms	29.9ms	0%	➖
kol-pagination	514.7ms	525.6ms	-2.1%	➖
kol-popover-button	77.6ms	89.2ms	-13%	✅
kol-progress	29.4ms	32ms	-8.1%	➖
kol-quote	24.3ms	24.7ms	-1.6%	➖
kol-select	86.3ms	89.6ms	-3.7%	➖
kol-skip-nav	21.3ms	20.4ms	+4.4%	➖
kol-spin	24.9ms	23.2ms	+7.3%	➖
kol-split-button	193.9ms	202.4ms	-4.2%	➖
kol-table-stateful	92.3ms	98ms	-5.8%	➖
kol-table-stateless	81.6ms	84.1ms	-3%	➖
kol-tabs	34.3ms	35.4ms	-3.1%	➖
kol-textarea	64.9ms	70.4ms	-7.8%	➖
kol-toolbar	35.8ms	34.9ms	+2.6%	➖
kol-tree	27ms	26.6ms	+1.5%	➖
kol-tree-item	81.5ms	82.5ms	-1.2%	➖
kol-version	160ms	161.3ms	-0.8%	➖

[deleonio]

#7977