fix(web): normalize UX copy to Kilo voice and terminology

[jeanduplessis]

Problem

Audited UI uses title case, generic actions (Submit, Done, Cancel, Yes), vague errors, Error:/Oops!, promotional adjectives, emoji, em dashes, three-dot loading text, and inconsistent product terminology.

Remediation action

Rewrite audited user-facing copy to follow Kilo UX-writing guidance.

Representative scope

• apps/web/src/components/auth/AuthErrorNotification.tsx:91
• apps/web/src/app/global-error.tsx:7
• apps/web/src/components/profile/UnlinkAccountDialog.tsx:47
• apps/web/src/components/organizations/members/InviteMemberDialog.tsx:205
• apps/web/src/app/(app)/credits/page.tsx:112
• apps/web/src/components/cloud-agent-next/ShareSessionDialog.tsx:114
• apps/web/src/components/app-builder/PromptInput.tsx:155
• apps/web/src/app/(app)/claw/components/ProvisioningStep.tsx:137
• apps/web/src/components/gastown/AgentStream.tsx:301
• apps/web/src/app/(app)/wasteland/new/NewWastelandWizardClient.tsx:484
• apps/web/src/app/(app)/install/page.tsx:78

Acceptance criteria

• UI copy uses sentence case and canonical product/capability terminology.
• Buttons use specific verb-object labels; destructive dialogs name destructive and keep outcomes.
• Errors state what happened and what to do next without humor, Oops!, or Error: prefixes.
• Loading copy names the operation and uses the ellipsis character.
• Promotional adjectives, emoji in product chrome, em dashes, vague Learn more, and inconsistent Kilo Code naming are removed from audited scope.