feat: Add minimal guided upgrade flag (collapsed by default)

[sea-snake]

Add minimal guided upgrade flag (collapsed by default).

To use this new feature flag, the app would need to set, e.g.:

identityProvider: "https://id.ai/authorize?feature_flag_min_guided_upgrade=true"

Changes

• Add MIN_GUIDED_UPGRADE feature flag.
• Show guided upgrade when flag is enabled.
• Make sure the guided upgrade is collapsed in case this flag is enabled.

[Copilot]

Pull request overview

Adds a new MIN_GUIDED_UPGRADE feature flag to enable the guided upgrade UI in a “minimal” mode where the upgrade panel starts collapsed.

Changes:

• Introduce MIN_GUIDED_UPGRADE feature flag store and register it with the global feature-flag registry.
• Render the guided upgrade panel when either GUIDED_UPGRADE or MIN_GUIDED_UPGRADE is enabled.
• Default the guided upgrade panel to collapsed when MIN_GUIDED_UPGRADE is enabled.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/frontend/src/routes/(new-styling)/(channel)/authorize/(panel)/+layout.svelte	Show upgrade panel under the new flag and default it to collapsed when MIN_GUIDED_UPGRADE is enabled.
src/frontend/src/lib/state/featureFlags.ts	Add and export the MIN_GUIDED_UPGRADE feature flag store so it can be initialized/overridden like other flags.

Comments suppressed due to low confidence (1)

src/frontend/src/routes/(new-styling)/(channel)/authorize/(panel)/+layout.svelte:158

• When MIN_GUIDED_UPGRADE is enabled and a selectedIdentity exists, the AuthPanel rounding logic still checks only $GUIDED_UPGRADE, so the panel won't get rounded-t-none even though the upgrade panel is rendered above it. Align this condition with the else-branch (include MIN_GUIDED_UPGRADE), ideally by using a single derived boolean (e.g. showGuidedUpgrade) to avoid these branches drifting again.

        <AuthPanel
          class={[
            "z-1",
            $GUIDED_UPGRADE && isUpgradeCollapsed && "rounded-t-none",
          ]}

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