fix(telemetry): make telemetry opt-in and off by default

[DevFlex-AI]

Upstream treats the default "unset" telemetry state as opted in (opt-out semantics), so any build made with a POSTHOG_API_KEY baked in sends usage data keyed to vscode.env.machineId before the user answers the consent banner. This flips the gate to true opt-in in both hosts:

// src/core/webview/webviewMessageHandler.ts (webviewDidLaunch and telemetrySetting cases)
const isOptedIn = telemetrySetting === "enabled" // was: !== "disabled"

// webview-ui/src/utils/TelemetryClient.ts
if (telemetrySetting === "enabled" && apiKey && distinctId) { // was: !== "disabled"

Dismissing the first-run telemetry banner now records an explicit "disabled" instead of silently posting "enabled", the English banner copy is rewritten to describe opt-in, and the stale translated copy is removed from the other 17 locales so they fall back to the accurate English text. PRIVACY.md now states telemetry is off by default.

Note that a keyless build was already inert (posthog-node throws on an empty key and the client registration is wrapped in try/catch), so this change is about policy: even a keyed build now stays silent until the user explicitly opts in. Cloud gateway telemetry paths are untouched per the decision to leave the gateway as-is.

Tests: telemetrySettingsTracking.spec.ts updated to document the new semantics (unset to disabled fires no transition event; unset to enabled fires after enabling), plus a new webview regression test asserting "unset" never initializes PostHog even when an API key and distinct ID are supplied. Ran the touched suites (telemetrySettingsTracking, webviewMessageHandler, webview TelemetryClient/App), tsc for src and webview-ui, and eslint with --prune-suppressions on the edited spec (suppression count did not increase).

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📥 Commits

Reviewing files that changed from the base of the PR and between 0354c8d and 8430f77.

📒 Files selected for processing (24)

• PRIVACY.md
• src/core/webview/__tests__/telemetrySettingsTracking.spec.ts
• src/core/webview/webviewMessageHandler.ts
• webview-ui/src/__tests__/TelemetryClient.spec.ts
• webview-ui/src/components/common/TelemetryBanner.tsx
• webview-ui/src/i18n/locales/ca/welcome.json
• webview-ui/src/i18n/locales/de/welcome.json
• webview-ui/src/i18n/locales/en/welcome.json
• webview-ui/src/i18n/locales/es/welcome.json
• webview-ui/src/i18n/locales/fr/welcome.json
• webview-ui/src/i18n/locales/hi/welcome.json
• webview-ui/src/i18n/locales/id/welcome.json
• webview-ui/src/i18n/locales/it/welcome.json
• webview-ui/src/i18n/locales/ja/welcome.json
• webview-ui/src/i18n/locales/ko/welcome.json
• webview-ui/src/i18n/locales/nl/welcome.json
• webview-ui/src/i18n/locales/pl/welcome.json
• webview-ui/src/i18n/locales/pt-BR/welcome.json
• webview-ui/src/i18n/locales/ru/welcome.json
• webview-ui/src/i18n/locales/tr/welcome.json
• webview-ui/src/i18n/locales/vi/welcome.json
• webview-ui/src/i18n/locales/zh-CN/welcome.json
• webview-ui/src/i18n/locales/zh-TW/welcome.json
• webview-ui/src/utils/TelemetryClient.ts

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