feat(studio): drop Modules tab, fold its content into Store detail (v0.35.0)

Modules-as-a-tab was redundant with the Store after the
"Installed" filter and the federation work landed. Two pieces
of unique content kept it alive: the per-module declared
permissions list and the on-disk module directory. Both now
live inside the Store detail sheet.

Changes:

- Sidebar nav loses the Modules entry. `_pages` no longer
  carries a `'modules'` slot. The unused `import
  'pages/modules.dart'` is dropped from main.dart. Smoke test
  updated to skip the Modules-text expectation.

- Store detail sheet (`_StoreDetailSheet`) gains two new
  sections, rendered only when the entry is installed and the
  hub returned `ModuleDetail` for it:

    Declared permissions  →  same icon-prefixed list the
                              old Modules sheet shipped
                              (`net:`, `fs.read:`, `fs.write:`,
                              `env:`, `hub:`).
    Module directory      →  selectable mono path so the
                              operator can paste it into a
                              shell.

  An async `moduleInfo` fetch fires from `initState` only when
  `widget.item.installed` is true, so the regular
  not-installed detail-sheet path takes no extra round-trip.
  Failures stay silent — the sections just hide.

- The `FaiModuleSheet` widget stays intact. Cmd+K still uses
  it as a quick-info modal for installed modules; the
  longer-form Store detail sheet covers the same data plus
  the description, screenshots, and docs that operators
  reach for in the Store.

Three new ARB keys: `storeSectionPermissions`,
`storeSectionDirectory`, `storeSectionPermissionsNone`.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/l10n/app_de.arb

@@ -194,6 +194,9 @@
   "storeSectionScreenshots": "Screenshots",
   "storeSectionDocumentation": "Dokumentation",
   "storeSectionSource": "Quelle",
+  "storeSectionPermissions": "Deklarierte Berechtigungen",
+  "storeSectionDirectory": "Modul-Verzeichnis",
+  "storeSectionPermissionsNone": "(keine — reines Berechnungsmodul)",
   "storeInstallingButton": "Installiere…",
   "storeNotInstallable": "Nicht installierbar",
   "storeNotInstallableTooltip": "Status „{status}\" — Installations-Pfad noch nicht verdrahtet.",

lib/l10n/app_en.arb

@@ -195,6 +195,9 @@
   "storeSectionScreenshots": "Screenshots",
   "storeSectionDocumentation": "Documentation",
   "storeSectionSource": "Source",
+  "storeSectionPermissions": "Declared permissions",
+  "storeSectionDirectory": "Module directory",
+  "storeSectionPermissionsNone": "(none — pure-computation module)",
   "storeInstallingButton": "Installing…",
   "storeNotInstallable": "Not installable",
   "storeNotInstallableTooltip": "Status \"{status}\" — install path not yet wired.",

lib/l10n/app_localizations.dart

@@ -1004,6 +1004,24 @@ abstract class AppLocalizations {
   /// **'Source'**
   String get storeSectionSource;
 
+  /// No description provided for @storeSectionPermissions.
+  ///
+  /// In en, this message translates to:
+  /// **'Declared permissions'**
+  String get storeSectionPermissions;
+
+  /// No description provided for @storeSectionDirectory.
+  ///
+  /// In en, this message translates to:
+  /// **'Module directory'**
+  String get storeSectionDirectory;
+
+  /// No description provided for @storeSectionPermissionsNone.
+  ///
+  /// In en, this message translates to:
+  /// **'(none — pure-computation module)'**
+  String get storeSectionPermissionsNone;
+
   /// No description provided for @storeInstallingButton.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_de.dart

@@ -522,6 +522,15 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get storeSectionSource => 'Quelle';
 
+  @override
+  String get storeSectionPermissions => 'Deklarierte Berechtigungen';
+
+  @override
+  String get storeSectionDirectory => 'Modul-Verzeichnis';
+
+  @override
+  String get storeSectionPermissionsNone => '(keine — reines Berechnungsmodul)';
+
   @override
   String get storeInstallingButton => 'Installiere…';
 

lib/l10n/app_localizations_en.dart

@@ -540,6 +540,15 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get storeSectionSource => 'Source';
 
+  @override
+  String get storeSectionPermissions => 'Declared permissions';
+
+  @override
+  String get storeSectionDirectory => 'Module directory';
+
+  @override
+  String get storeSectionPermissionsNone => '(none — pure-computation module)';
+
   @override
   String get storeInstallingButton => 'Installing…';