feat(ios): brand marks for PagerDuty, Pylon, Datadog, Alertmanager and AWS

[jonwiggins]

Summary

iOS fell back to SF Symbols for the four event sources that got no brand asset in Connections v2 / v0.13 (PagerDuty → bell, Pylon → life preserver, Alertmanager → ECG line, Datadog → dog), and the Connections hub drew every provider with a stand-in symbol. This PR gives them the same marks the web (brand-icon.tsx) and Android (BrandMarks.kt) already use.

• Five new imagesets in Shared/Brands.xcassets: brand.pagerduty, brand.pylon, brand.datadog, brand.alertmanager, brand.aws — the web's path data, template-rendered, vector preserved, same Contents.json shape as brand.linear.
• Brand gains pagerduty / pylon / datadog / alertmanager / aws; Brand(url:) recognizes *.pagerduty.com, *.usepylon.com, *.datadoghq.com|eu, Grafana / Alertmanager hosts and AWS console links.
• Triggers: Glyph.trigger and the work form's WhenType.glyph return the brand for the four sources, so every surface that uses TriggerIcon / the Starts row picks them up: New work form, scheduled Task / Job / agent trigger lists, Local automations, local terminal "Open ticket". TriggerIcon.label now reads the brand's label (no special cases).
• Connections hub: new Glyph.provider(icon:) maps the catalog's icon key → brand mark (notion, github, slack, linear, sentry, aws, pylon, pagerduty) or a generic symbol (database, folder, terminal, globe, else a plug), mirroring connection-mark.tsx. The catalog rows, the new-connection sheet, and now each connection row (via OptioRow's glyph) use it; ConnectionIcons.symbol(for:) is gone.
• Build fix (unrelated, but blocking): SwiftTerm is pinned to exactVersion: 1.20.0 in project.yml. 1.99.0 (released 2026-10-08) removed TerminalView.getTerminal(), which TerminalTheme and LocalTerminalStream call, so a fresh resolve of from: 1.2.0 no longer compiles (CI doesn't build iOS, so nothing caught it). Lift the pin once those call sites move to the new API.

Verification

• make build (xcodegen + xcodebuild, iPhone simulator): succeeds.
• Unit tests BrandMarkTests (7) and WorkFormModelTests (45): pass. testEveryAssetLoads / testBrandMarksAreMonochrome cover the new imagesets; new testProviderGlyphs covers the catalog mapping; URL and trigger expectations updated.
• New BrandMarksUITests (skips without OPTIO_UITEST_SERVER_URL): launched against a hermetic seeded API (apps/android/scripts/test-api.sh, port 4966), scrolled the Connections catalog to Pylon / AWS / PagerDuty and walked the New work form to each of pylon / datadog / alertmanager via OPTIO_DEV_NEW_SESSION_TWEAKS. Both pass; screenshots confirmed the marks render (catalog: Linear, Pylon, PostgreSQL, Sentry, AWS, PagerDuty; Starts row: "PagerDuty incident", "Pylon event", "Datadog monitor", "Grafana / Alertmanager alert" each with its mark). Screenshots were taken from the simulator and are not committed.

Notes

• Android already ships these marks; this brings iOS to parity. The web keeps a postgresql / bitbucket brand that no catalog provider uses (database icon key), so iOS doesn't add them.