Remove per-tooltip delay overrides so all tooltips share one delay

[bcotrim]

Related issues

• Related to STU-1985 — piece 1 of splitting Agentic UI: Simplify Sidebar with new Site-Centric Focus #3998 into small PRs

How AI was used in this PR

Commit cherry-picked from #3998 (authored by @shaunandrews with AI assistance); Claude Code handled the cherry-pick onto trunk and ran lint/typecheck/tests.

Proposed Changes

• The composer toolbar (add-attachment, model pill, stop, send) and the site dropdown trigger each wrapped their tooltip in a local Tooltip.Provider delay={ 0 }, so those tooltips popped instantly while the rest of the app used the default hover delay.
• Drops the local overrides so every tooltip inherits the app-wide provider (AppProviders) and its default delay/hover group — one consistent tooltip feel across the app.
• The composer test harness keeps a zero delay locally so its assertions stay deterministic.

Testing Instructions

• Open the agentic UI and hover the composer buttons (attachment, model pill, send/stop) and the site dropdown trigger.
• Tooltips should appear after the same default hover delay as other tooltips in the app (no longer instantly), and still display correctly.

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

🤖 Generated with Claude Code

[wpmobilebot]

📊 Performance Test Results

Comparing 72ba0dd vs trunk

app-size

Metric	trunk	72ba0dd	Diff	Change
App Size (Mac)	1419.26 MB	1419.26 MB	0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	72ba0dd	Diff	Change
load	1083 ms	1079 ms	4 ms	⚪ 0.0%

site-startup

Metric	trunk	72ba0dd	Diff	Change
siteCreation	7007 ms	6998 ms	9 ms	⚪ 0.0%
siteStartup	2358 ms	2354 ms	4 ms	⚪ 0.0%

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Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)

[gavande1]

LGTM ✅