feat(keyboard): unify assistant voice and AI workflows

Merge dictation and AI controls into one assistant surface, preserve safe insertion and clipboard actions, and align settings and tests with the new flow.

docs/APPSTORE_METADATA.md

@@ -1,4 +1,4 @@
-# App Store Connect — OSGKeyboard 1.8.0 (build 72)
+# App Store Connect — OSGKeyboard 1.8.0 (build 74)
 
 > Current metadata baseline for the iOS/iPadOS App Store build. Version and build
 > numbers come from `project.yml`. The repository also contains a separate
@@ -11,7 +11,7 @@
 | App name | `OSGKeyboard` | ≤ 30 characters |
 | Subtitle | `Voice input, everywhere` | ≤ 30 characters |
 | Bundle ID | `com.osgkeyboard.ios` | iOS host target |
-| Version / build | `1.8.0` / `72` | `MARKETING_VERSION` / `CURRENT_PROJECT_VERSION` |
+| Version / build | `1.8.0` / `74` | `MARKETING_VERSION` / `CURRENT_PROJECT_VERSION` |
 | Minimum system | iOS/iPadOS 26 | iPhone and iPad |
 | Primary locale | `en-US` | Simplified Chinese is also bundled |
 | Primary category | Utilities | |
@@ -211,10 +211,10 @@ standard HTTPS. Re-evaluate this answer if non-exempt cryptography is added.
 
 ## Submission checklist
 
-- [ ] Confirm `project.yml` still reads version 1.8.0 / build 72
+- [ ] Confirm `project.yml` still reads version 1.8.0 / build 74
 - [ ] Open the existing Xcode project (do not regenerate unless needed)
 - [ ] Run the release build and test suites on macOS with Xcode 26
 - [ ] Replace screenshots with captures from the submitted build
 - [ ] Verify the privacy answers against the submitted provider features
 - [ ] Confirm the tip product remains optional and unlocks no feature
-- [ ] Upload, select build 72, add review notes, and submit
+- [ ] Upload, select build 74, add review notes, and submit