[alexwrite]

Context

Closes #58 on merge. On a Symfony project organised by type (src/Controller/, src/Service/, src/Command/...), level 1 of zoom-html presented type folders as domains (Command, Form, Enum, EventSubscriber, DataFixtures), put 290 classes in "(no domain)" and folded 89 small domains. The business split lives one level lower: src/Service/<Domain>/, src/Controller/<Domain>/.

Fix

• _TYPE_DIRS: closed list of folder names that framework generators give to a kind of class (Symfony maker, Laravel make:*) plus the layer folders. Never a business domain.
• detect_layout(class_files, root): by-type when at least half of the classes under the code root sit below a type folder, else by-domain. Exposed as layout in the page data and stated in the level 1 introduction.
• classify_domain(path, root, layout): by type, the first non-type folder below the root (src/Service/Billing/X.php gives Billing, app/Http/Controllers/Admin/X.php gives Admin); by domain, the first folder unless it is a type folder. No domain folder: the explicit "Common" group (was "(no domain)"), with its own legend entry.
• Column order unchanged and already as requested: Route (hidden while empty, Framework : ajouter routes, injection et événements depuis l'export du framework #47), Controller, Service, Repository, Entity / Model, View, Other.
• Level 2 triangle icon glyph raised from 11 to 12 px (no text under 12 px).

Measured on real repositories (--code-only)

Project	Before	After
Project A, Symfony by type	103 groups; Enum 167, Message 100, DataFixtures 76, Command 71, Form 60 shown as domains; 290 without domain	detected by-type; 94 business or module domains (ProbeNetwork, Admin, Retention, Osint, Host, Account, Economy...); Common 1,068
ClientXCMS, Laravel 12	37 groups; Http, DTO, Console, Events, Contracts, Providers as domains	detected by-type; 24 domains (Admin, Billing, Core, Store, Provisioning, Helpdesk...); Common 190
Project B, Symfony by domain	5 domains + 1 class without domain	unchanged, detected by-domain

Quality (commands actually run, after the last change)

• uv run pytest tests/test_zoom_html.py -q: 29 passed. Without the change: import error on main; with layout detection forced to by-domain: 2 failed.
• uv run pytest tests/ -q: 7648 passed, 14 skipped.
• uv run ruff check .: all checks passed. uv run pyright on the touched files: 0 errors.
• axe-core 4.10.3 (WCAG 2.0/2.1 A and AA): 0 violations on 3 levels x 2 themes x 3 repositories; keyboard round trip and 320 px checked; no text under 12 px.

Limits

• Common still holds a third of project A (flat Entity/, Repository/, Enum/, Message/): zoom-html : rattacher par l'usage les classes du groupe Common à leur domaine unique #60 proposes attaching a class to the single domain that uses it, by evidence.
• Infrastructure modules that are not framework type folders (Logging, Sentry, Mailer...) appear as domains; declared domains are Contrôles d'architecture déclaratifs avec score et SARIF, sur le modèle de Plumber #51.
• Long links can still overlap their labels at level 1 (Vue zoom-html : les liens longs passent derrière les boîtes du niveau 1 #54).

[github-actions]

Thanks for the pull request, @alexwrite. A maintainer will review it soon.

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A couple of things that speed up review: make sure the test suite passes on Python 3.10 and 3.13, and that the change keeps extraction deterministic.