feat: enhance AlertDialog and ConfirmDialog providers with customizable message defaults

[phev8]

No description provided.

[greptile-apps]

Greptile Summary

This PR adds opt-in messages props to AlertDialogProvider and ConfirmDialogProvider, allowing app-level copy defaults (titles, button labels, confirmation label template) that can be overridden per alert()/confirm() call. ConfirmDialogProvider also gains a defaultVariant prop. The refactor correctly replaces || with ?? so that explicit empty-string call-site values are respected, and moves hardcoded English strings into DEFAULT_*_MESSAGES constants.

Confidence Score: 5/5

Safe to merge; all open concerns are P2 and were flagged in prior review threads.

No new P0 or P1 issues found. The || → ?? migration is correct, DEFAULT_*_MESSAGES constants are well-structured, and the per-call override precedence is implemented correctly throughout. The two previously flagged concerns (missing useMemo on resolvedMessages and the stale JSDoc) remain P2 and are already tracked.

registry/radix-nova/confirm-provider.tsx and registry/radix-nova/alert-provider.tsx — useMemo on resolvedMessages (tracked in prior review thread).

Important Files Changed

Filename	Overview
registry/radix-nova/confirm-provider.tsx	Adds ConfirmDialogMessages interface, DEFAULT_CONFIRM_MESSAGES constant, and messages/defaultVariant props; switches fallbacks from
registry/radix-nova/alert-provider.tsx	Adds AlertDialogMessages interface, DEFAULT_ALERT_MESSAGES constant, and messages prop; resolvedMessages is computed inline (no useMemo), previously flagged.
registry/radix-nova/confirm-dialog.tsx	Adds requireConfirmationLabel as a required prop, removes hardcoded default string, and falls back to the provider-supplied label. JSDoc on label still references old hardcoded default (previously flagged).
components/docs/interactive-examples/confirm-dialog.tsx	Moves per-call confirmButtonText/cancelButtonText/label to the provider messages prop to showcase the new feature; minor provider-scope mismatch for "Keep item" but acceptable for a demo.
components/docs/interactive-examples/alert-dialog.tsx	Moves buttonLabel from per-call to the provider messages prop; clean, no issues.
content/docs/components/confirm.mdx	Adds Provider Defaults section, Next.js + next-intl usage guide, and updated configuration tables; accurate and helpful.
content/docs/components/alert-provider.mdx	Adds Provider Defaults section and updated configuration table; accurate and well-structured.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["alert(options) / confirm(options)"] --> B{options.field\nnot undefined?}
    B -- Yes --> C["Use per-call value"]
    B -- No --> D{messages prop\nprovided to provider?}
    D -- Yes --> E["Use messages.field"]
    D -- No --> F["Use DEFAULT_*_MESSAGES\nhardcoded fallback"]

    subgraph confirmOnly["ConfirmDialog only"]
        G["requireConfirmationInput.label?"] -- present --> H["Use per-call label"]
        G -- absent --> I["Use resolvedMessages\n.requireConfirmationLabel"]
        I --> J["Split on {{confirmTerm}}\nrender bold placeholder"]
    end

    C & E & F --> confirmOnly

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_{Reviews (2): Last reviewed commit: "refactor: replace getRequireConfirmation..." | Re-trigger Greptile}