feat: add connection-scoped workspaces

[ibourgeois]

Summary

• add durable workspaces scoped to each saved connection
• persist and switch the active workspace per connection in the desktop shell
• replace the placeholder shell workspace state with real workspace records and UI
• repair legacy workspace upgrades so Surreal backfills also sync the workspace sequence

Testing

• '/Users/ibourgeois/Library/Application Support/Herd/bin/php84' artisan test --compact tests/Feature/WorkspaceManagementTest.php tests/Feature/DesktopShellTest.php tests/Feature/InstanceConnectionManagementTest.php tests/Feature/SurrealWorkspaceModelTest.php
• '/Users/ibourgeois/Library/Application Support/Herd/bin/php84' artisan test --compact tests/Feature/DesktopShellTest.php tests/Feature/DesktopUiFeatureFlagTest.php

Closes #133
Fixes #140

[Copilot]

Pull request overview

Adds durable, connection-scoped workspaces and wires them into the desktop shell so each saved connection can persist and switch its own active workspace.

Changes:

• Introduces workspaces persistence (model, factory, migrations) and active_workspace_id on instance_connections.
• Adds workspace create + activate endpoints and updates the home shell to resolve/render the active workspace per connection.
• Updates UI and feature tests to reflect the new workspaces navigation/state (and splits Surreal “preview workspace” into SurrealWorkspace).

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/Feature/WorkspaceManagementTest.php	New feature coverage for workspace creation, activation, and per-connection active workspace persistence.
tests/Feature/SurrealWorkspaceModelTest.php	Updates Surreal-backed preview workspace test to use SurrealWorkspace / workspace_previews.
tests/Feature/InstanceConnectionManagementTest.php	Adjusts expectations to show active workspace name + # general room placeholder.
tests/Feature/DesktopUiFeatureFlagTest.php	Updates shell assertions to match the new workspace-driven UI.
tests/Feature/DesktopShellTest.php	Seeds workspaces and validates new “Workspaces” section + active workspace display.
routes/web.php	Registers workspaces.store and workspaces.activate routes under auth.
resources/views/welcome.blade.php	Replaces placeholder shell “Favorites” with “Workspaces” list + create workspace modal; updates active header/input copy.
resources/views/components/desktop/nav-item.blade.php	Adds form-backed action support for POST-based nav items (used for workspace activation).
database/migrations/2026_03_27_063640_create_workspaces_table.php	Creates workspaces table (with driver-conditional FK behavior).
database/migrations/2026_03_27_063705_add_active_workspace_id_to_instance_connections_table.php	Adds active_workspace_id (with FK for non-surreal drivers).
database/factories/WorkspaceFactory.php	Factory for generating workspaces tied to an instance connection.
app/Support/Connections/InstanceConnectionManager.php	Adds workspace listing/creation/activation + default workspace resolution.
app/Models/Workspace.php	Converts Workspace to an Eloquent model related to InstanceConnection.
app/Models/SurrealWorkspace.php	New Surreal-backed model for desktop preview records (workspace_previews).
app/Models/InstanceConnection.php	Adds workspaces() and activeWorkspace() relationships + fillable active_workspace_id.
app/Http/Requests/StoreWorkspaceRequest.php	Validates workspace creation input.
app/Http/Controllers/WorkspaceController.php	Implements workspace create and activate actions with ownership checks.
app/Http/Controllers/HomeController.php	Resolves active workspace + workspace links for the shell; uses SurrealWorkspace::desktopPreview() for Surreal preview seeding.

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