🤖 fix: make TitleBar tooltip CTAs clickable links

[ibetitsmike]

Summary

Makes the call-to-action text in the TitleBar tooltips actually clickable: the version tooltip's "Click for more details" now opens the About dialog, and the gateway/provider route tooltip's "Click to open gateway settings" / "Click to open provider settings" now opens Settings → Providers with the active provider expanded.

Fixes #2330

Background

Both tooltips ended in CTA copy that read like a link but was inert plain text, so clicking the words did nothing (UX papercut). The actions were only reachable by clicking the trigger buttons themselves.

Implementation

• The two CTAs are now link-styled <button> elements inside the shared TooltipContent, invoking the exact same handlers as their triggers (openAboutDialog, openSettings("providers", { expandProvider: activeRouteProvider })). Shared link styling lives in a local TOOLTIP_CTA_CLASSNAME constant.
• Clicking inside tooltip content works because the app-level TooltipProvider keeps Radix hoverable-content enabled (pointer can travel from trigger into the tooltip).
• Both affected tooltips are now controlled (open/onOpenChange) so the CTA click closes the tooltip before the About dialog / Settings surface opens; otherwise the z-indexed tooltip lingers on top.

Validation

• make static-check green locally.
• Remote dogfood UAT (browser-mode dev server at this exact head): PASS. Verified pointer travel into both tooltips, CTA clicks open the About dialog / Settings → Providers with the right provider expanded (OpenRouter via real UI flow; Xum Gateway branch incl. Balance/Concurrent rows in logged-out state), no lingering tooltips after any click (DOM-checked), trigger-click regressions unaffected, other TitleBar tooltips unchanged, no overflow at 375px.
• Known minor UAT observations (accepted, not fixed): tooltip CTA is pointer-only (Radix tooltips close on Tab; the focusable trigger performs the identical action), and the hover color shift is gated by @media (hover: hover) like all other hover styles.

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Generated with mux • Model: anthropic:claude-fable-5 • Thinking: xhigh

[ibetitsmike]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep it up!

Reviewed commit: bc04e69e16

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