feat(web): another Environment's browser is named by the shell, not by its address

[immakermatty]

Status: ready for review. Merge after Lazurio/LazurioPlatform#339, which adds the element. The order is not critical: without the element the head falls back (below).

Why

On 2026-10-12, Matěj asked that an Environment be named the same everywhere, from one source: the switcher and the browser view's badge are the same thing. The panel's head over another Environment's view named it " · " from the view's address. That was a third copy of a rule the shell does not follow: an Environment is named by its own name and who it is for, never by its machine.

What changes

• The head over another Environment's view is now the shell's <lazurio-environment environment="<id>" lang> (LazurioPlatform#339, F39 addendum of 2026-10-12).
  • It names that Environment as its switcher does: glyph, name and who line, from this page's shell state (the person's account merged in).
  • viewEnvironmentId gives the id: the view's host between browser. and .lazurio.io (vm-02.acme, jana).
• Fallback: until the shell knows that Environment, and on a Platform without the element, the head says only "Prohlížeč jiného Environmentu" / "Another Environment's browser". The view's own bar right under it names the Environment precisely: it asks this page's shell, or uses its server's identity.
• No name left elsewhere: the frame's title and the sign-in notice ("Přihlas se do prohlížeče tohoto Environmentu") no longer carry a name.
• Removed: foreignEnvironmentLabel, foreignEnvironmentIcon and the GitHub picture. The fork has no naming rule of its own.
• Runbook: "Záložka jiného Environmentu" is updated.

What does not change

• The warning look (border, coloured head), the framing, the referrer policy, the sign-in fallback's timing and actions.
• This Environment's own view head ("Environment browser").

Verification

• vp test run src/lazurio (web): 72 passed. The foreign-view test now checks:
  • the element's environment (vm-02.acme) and lang;
  • the fallback text;
  • no old label and no picture;
  • the frame titles.
  • The id test covers an Organization's Environment, a personal one and more labels.
• node --test scripts/lazurio-release-contract.test.mjs: 22 passed.
• vp fmt --check: clean. Web typecheck: clean.
• Browser check (root 0178) on the canary after the Platform release: another Environment's tab in T3's panel shows the same name as that Environment's switcher.

🤖 Generated with Claude Code

[agentrozjedemeai]

@immakermatty — APPROVED for exact head a20a6ef. The foreign-view header passes the validated view-host Environment ID to the Platform shell element; React 19 renders environment/lang/class as attributes, including the warning classes, and its light-DOM child remains the generic fallback before upgrade or on older Platforms. The warning border/header, iframe origin policy and sign-in timeout/actions remain intact; frame title/sign-in text no longer invent a name. Locally: web overlay 72/72, release contract 22/22, web typecheck and focused format check pass; diff --check clean. Dependency: merge after Lazurio/LazurioPlatform#339 for shell-provided identity; without it the generic header remains. This review does not merge or release.

[immakermatty]

Merged (rebase) at b122de4 and released in 0.0.45-preview.20261012.2, on the canary. The local worktree was removed after verifying both commits are on main and the remote branch holds the same head.