feat: add What's New panel on extension update

[ralphstodomingo]

What

Adds a curated What's New page that opens in the center editor area — like VS Code's own Release Notes — the first time the extension activates after a minor or major version bump. Patch releases stay silent. Content is fetched at runtime from a build-generated changelog manifest, so highlights refresh without shipping a new extension build.

Implements the What's New product spec (a fresh take superseding the stale approach in #1914, which hand-authored static HTML and opened on any version change).

How it works

• WhatsNewPanel (src/webview_provider/whatsNewPanel.ts) — a one-off editor-area webview. Auto-opens only on a minor/major upgrade (semver-gated), always persists the seen version so users aren't re-prompted, and defers to the setup walkthrough on a fresh install. Fetches the manifest host-side with an offline cache fallback.
• Command + settings — dbt Power User: Show What's New (dbtPowerUser.showWhatsNew) to reopen on demand; dbt.showChangelogOnUpdate (default true) to opt out of auto-open; dbt.whatsNewManifestUrl to point at a manifest for local/staging testing.
• Webview module (webview_panels/src/modules/whatsNew/) renders the manifest grouped New → Improved → Fixed, with an "Also from Altimate AI" product sidebar and a contents rail. Entry titles deep-link to base_url + anchor on the website changelog.
• Telemetry — whats_new_page_opened (version, items_shown, trigger), changelog_item_clicked (anchor, version, tag), full_changelog_clicked (version).
• Design system — uses @altimateai/ui-components/lego (Spinner) + ui-components styles under al-tw-scope, matching the same subpath-import pattern already used for @altimateai/ui-components/lineage.

The manifest contract:

{ "product": "dbt-power-user", "version": "1.43.0", "generated_at": "...",
  "base_url": "https://www.altimate.ai/changelog",
  "items": [ { "title": "...", "tag": "new|improved|fix", "summary": "...", "anchor": "#..." } ] }

A sample-manifest.json is included for local rendering via the whatsNewManifestUrl override.

Dependencies / gates

• Manifest endpoint (Comm Center). The fetch URL is a placeholder pending the Comm Center IDE-manifest endpoint + keying (per-version file vs single feed). Marked TODO in whatsNewPanel.ts; overridable via dbt.whatsNewManifestUrl until then.
• ui-components release. The @altimateai/ui-components/lego subpath (the Spinner re-export) ships in AltimateAI/altimate-frontend#2920; webview_panels is pinned to 0.0.87. Until that publishes, the webview build is verified locally via source-pointing to the frontend package.

Verification

• Extension backend tsc -p ./ — 0 errors; ESLint clean on changed files.
• Webview vite build clean — module + lego Spinner bundle without resolution errors (verified against the source-pointed ui-components package).
• Full in-editor render (before/after screenshots) to follow once the manifest endpoint or sample-serving is wired for E2E.

Draft — pending the manifest endpoint and the ui-components 0.0.87 release.

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• Commit unit tests in branch feat/whats-new-panel

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