feat: add connection profiles and remote auth flow

[ibourgeois]

Summary

• add saved instance connection profiles with active switching, editing, and deletion
• introduce in-app remote server authentication and persist remote identity/cookie context per connection
• refine the desktop shell and auth surfaces around connections, profile state, and current-instance behavior

Testing

• vendor/bin/pint --dirty --format agent
• php artisan test --compact tests/Feature/InstanceConnectionManagementTest.php tests/Feature/FortifyAuthenticationTest.php tests/Feature/DesktopShellTest.php

[Copilot]

Pull request overview

Adds a first-class “instance connection” concept to the desktop shell, enabling users to save/switch server connection profiles and authenticate to remote Katra servers in-app while persisting per-connection remote identity + cookie context.

Changes:

• Introduce InstanceConnection model + persistence (migration/factory) and a manager service for resolving/activating connections.
• Add remote in-app server authentication flow (guest + saved-connection) and wire up new connection/profile routes.
• Update desktop shell UI to be connection-aware (switching, editing, deletion) and expand feature/flow test coverage.

Reviewed changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
tests/Feature/InstanceConnectionManagementTest.php	New end-to-end tests for connection CRUD/activation, shell behavior, and remote auth context persistence.
tests/Feature/FortifyAuthenticationTest.php	Extends guest “connect server” coverage to include in-app credential step and remote sign-in behavior.
tests/Feature/DesktopUiFeatureFlagTest.php	Ensures DB-backed user records exist for feature-flag scope tests (uses RefreshDatabase + create).
tests/Feature/DesktopShellTest.php	Updates shell expectations to reflect connection-aware UI and active connection rendering.
routes/web.php	Adds connection/profile/auth routes and moves home/profile into auth group.
resources/views/welcome.blade.php	Replaces workspace selector surface with a connections switcher + add/edit/delete connection modals.
resources/views/components/desktop/profile-menu.blade.php	Adjusts shell profile menu styling and removes “Manage connections” entry.
resources/views/auth/connect-server.blade.php	Converts server connect screen into a 2-step flow (URL → credentials) and supports saved-connection sign-in.
resources/css/app.css	Adds hover/transition styling for the shared “connection trigger” surface.
database/migrations/2026_03_24_083829_create_instance_connections_table.php	Creates instance_connections table with metadata + session context storage.
database/factories/InstanceConnectionFactory.php	Factory states for server/current-instance connections for tests.
app/Support/Connections/RemoteInstanceAuthenticator.php	Implements remote login form bootstrap, CSRF extraction, cookie capture, and optional profile fetch.
app/Support/Connections/InstanceConnectionManager.php	Centralizes connection listing, active resolution, activation tracking, and auth context persistence.
app/Models/User.php	Adds instanceConnections() relationship.
app/Models/InstanceConnection.php	New model with encrypted session context + computed attributes for UI.
app/Http/Requests/UpdateInstanceConnectionRequest.php	Validation rules for editing/renaming current-instance vs server connections.
app/Http/Requests/StoreInstanceConnectionRequest.php	Validation rules/messages for adding a saved server connection.
app/Http/Requests/ConnectServerRequest.php	Validation rules/messages for guest “server URL” step.
app/Http/Requests/AuthenticateRemoteInstanceConnectionRequest.php	Validation rules/messages for remote credential submission (guest or authed).
app/Http/Controllers/InstanceConnectionController.php	Implements connect/prepare/authenticate flows plus connection CRUD and profile endpoint.
app/Http/Controllers/HomeController.php	Makes the desktop shell render based on the active connection + passes connection/link/viewer identity state to the UI.

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