## Problem
When a user is invited to a team, the SaaS web app shows **no invitation
banner** — even though the pending invite is returned by
`/api/v1/team/invitations/pending` on refresh.
## Root causes
1. **Never rendered in SaaS.** `TeamInvitationBanner` only existed in
`desktop/`, wired solely into `DesktopBannerInitializer`. The SaaS
banner stack rendered only `<UpgradeBanner />`.
2. **Single banner slot.** `BannerContext` holds one node; `setBanner`
replaces it. `TrialStatusBanner` called `setBanner(null)` when there was
no active trial (and re-fired once `trialStatus` resolved async), wiping
any other banner.
3. **Shadowing was too fragile.** A first attempt shadowed the
proprietary `UpgradeBannerInitializer` from the saas layer, but
`vite-tsconfig-paths` resolves the `@app` specifier once at dev-server
start — a newly-added shadow of an already-resolved module isn't picked
up on a browser refresh, only a full restart. So the proprietary
initializer kept running and no invite banner appeared (while the SaaS
team context still fetched + populated the invite, which is why the
pending call was visible).
## Fix
- Add `saas/components/shared/TeamInvitationBanner.tsx` — ported from
desktop, minus the desktop `connectionMode` gate and explicit billing
refresh (SaaS `acceptInvitation` already refreshes credits + session).
- Render it **inline in `saas/routes/Landing.tsx`** next to
`GuestUserBanner` — a new import specifier in an existing file
(HMR-friendly), unambiguously inside `SaaSTeamProvider`, mirroring the
proven `GuestUserBanner` pattern. No dependency on the single banner
slot.
- **Remove `TrialStatusBanner`** (trials are being retired) so it can't
clobber banners. Also drops the stale mention from the stripe-lazy-load
test comment.
## Verification
- `tsc --noEmit -p tsconfig.saas.vite.json`: clean in touched files;
total unchanged from baseline (37 pre-existing, unrelated).
- Manual: pull + verify the Accept/Decline banner appears for an account
with a pending invite.
