feat: show Payment Not Required when Stripe is disabled (CPL-191)

[GTC6244]

Summary

When the Stripe integration is disabled (missing keys or misconfigured), the dashboard now:

• Hides the "Add Funds" button and balance display
• Shows a "Payment Not Required" badge in the topbar
• Shows an explanatory banner advising users to migrate to production for uptime guarantees

The check calls /billing/stripe_config on login and caches the result. Transient failures retry after 30s; permanent "not configured" responses cache indefinitely. Cache resets on logout.

Review fixes included: dark-mode CSS variable (--bg-muted), guard on openAddFundsModal, .catch() on promise chain.

Pre-Landing Review

5 informational issues found and fixed during /review:

• [AUTO-FIXED] Stale billing cache across logout/re-login
• [AUTO-FIXED] Missing .catch() on billing promise chain
• [AUTO-FIXED] openAddFundsModal callable when billing disabled
• [AUTO-FIXED] --bg-muted CSS var undefined for dark mode
• [USER-FIXED] Transient errors permanently cached as "billing unavailable" (TTL retry)

Scope Drift

Scope Check: CLEAN
Intent: CPL-191 — hide Add Funds, show Payment Not Required when Stripe disabled
Delivered: Exactly that across 3 dashboard files

Test plan

• Verify "Payment Not Required" badge appears when Stripe keys are not configured
• Verify "Add Funds" button and balance appear when Stripe keys are configured
• Verify dark mode renders the banner correctly
• Verify logout/re-login resets the billing availability check

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR updates the Lit Express dashboard UI to gracefully handle environments where Stripe billing is not configured, hiding funding-related controls and surfacing a “Payment Not Required” indicator and explanatory messaging.

Changes:

• Add a billing availability check (via /billing/stripe_config) and conditionally show/hide balance + “Add Funds”.
• Introduce a “Payment Not Required” topbar badge and an in-dashboard informational banner.
• Add CSS support for the new badge/banner, including --bg-muted for light/dark themes.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
lit-static/dapps/dashboard/styles.css	Adds --bg-muted and styles for the new badge + banner.
lit-static/dapps/dashboard/index.html	Adds the hidden-by-default badge and billing-disabled banner containers.
lit-static/dapps/dashboard/app.js	Implements billing availability caching and UI toggling based on Stripe configuration.
lit-api-server/blockchain/lit_node_express/contracts/AccountConfigFacets/SecurityLib.sol	Import formatting normalization.
lit-api-server/blockchain/lit_node_express/contracts/AccountConfigFacets/AppStorage.sol	Clarifies configOperator comment.

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[graphite-app]

Infinite retry loop causing unnecessary API calls. When billing is unavailable and the user remains logged in, this creates a perpetual 30-second retry cycle that never stops. Each retry schedules another updateAuthUI() call, which checks billing, fails, and schedules another retry indefinitely.

This contradicts the PR description which states "permanent 'not configured' responses cache indefinitely" - but all failures are treated identically and retry forever.

Impact: Continuous background API calls every 30s for all logged-in users on environments without Stripe, causing unnecessary server load and potential rate limiting.

Fix: Only retry for actual transient errors, not permanent configuration issues. Either:

// Option 1: Distinguish transient vs permanent failures
try {
  const client = await getClient();
  const config = await client.getStripeConfig();
  _billingAvailable = true;
  _isPermanentFailure = false;
} catch (err) {
  _billingAvailable = false;
  _isPermanentFailure = err.status === 404 || err.code === 'NOT_CONFIGURED';
}
// Then on line 83, only retry if not permanent:
if (!_isPermanentFailure) {
  setTimeout(() => updateAuthUI(), BILLING_RETRY_MS);
}

Or remove the setTimeout entirely and rely on manual user refresh/re-login to detect when Stripe becomes available.

Suggested change

	setTimeout(() => updateAuthUI(), BILLING_RETRY_MS);
	if (!_isPermanentFailure) {
	setTimeout(() => updateAuthUI(), BILLING_RETRY_MS);
	}

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