fix(#287): fix empty-state subtitles and content description on Keys and Profiles screens (#311)

* fix(#287): fix empty-state subtitles and content description on Keys and Profiles screens

- Added `keys_empty_desc` and `profiles_empty_desc` string resources.
- Updated `KeysScreen.kt` and `ProfilesScreen.kt` to use correct empty-state subtitles instead of the copy-pasted `toolsets_empty_desc`.
- Added `content_desc_edit` string resource and applied it to the edit icon in `KeysScreen.kt` for accessibility.

* fix(#287): correct empty-state descriptions and accessibility content descriptions

- Replaced incorrect `toolsets_empty_desc` with newly added `keys_empty_desc` on the Keys screen.
- Replaced incorrect `toolsets_empty_desc` with newly added `profiles_empty_desc` on the Profiles screen.
- Updated the content description of the edit icon on the Keys screen to use newly added `content_desc_edit` instead of `nav_drawer_section_converse`.

app/src/main/java/com/m57/hermescontrol/ui/keys/KeysScreen.kt

@@ -102,7 +102,7 @@ fun KeysScreen(
             state.envVars.isEmpty() -> {
                 EmptyState(
                     title = stringResource(R.string.keys_empty_title),
-                    subtitle = stringResource(R.string.toolsets_empty_desc),
+                    subtitle = stringResource(R.string.keys_empty_desc),
                     onAction = { viewModel.loadKeys() },
                     actionLabel = stringResource(R.string.content_desc_refresh),
                     modifier = Modifier.padding(paddingValues),
@@ -232,7 +232,7 @@ fun KeysScreen(
                                                             imageVector = Icons.Filled.Edit,
                                                             contentDescription =
                                                                 stringResource(
-                                                                    R.string.nav_drawer_section_converse,
+                                                                    R.string.content_desc_edit,
                                                                 ),
                                                         )
                                                     }

app/src/main/java/com/m57/hermescontrol/ui/profiles/ProfilesScreen.kt

@@ -97,7 +97,7 @@ fun ProfilesScreen(
             state.profiles.isEmpty() -> {
                 EmptyState(
                     title = stringResource(R.string.profiles_empty_title),
-                    subtitle = stringResource(R.string.toolsets_empty_desc),
+                    subtitle = stringResource(R.string.profiles_empty_desc),
                     onAction = { viewModel.loadProfiles() },
                     actionLabel = stringResource(R.string.content_desc_refresh),
                     modifier = Modifier.padding(paddingValues),