chore(web): finalize web/ project parity with base-repo TS config settings (aside from JS version target) 🔩

[jahorton]

For some reason, I expected these final flags to be worse than enforcing strictFunctionTypes. Maybe it's due to some of the changes the previous setting triggered, but this part went quite swimmingly.

Fixes #11473.

User Testing

TEST_DEVELOPER_KMC: Using the test build of Keyman Developer, verify that keyboard compilation works properly.

1. In your local copy of the keyboards repo, run ./build.sh clean.
2. Open Keyman Developer.
3. Open any keyboard project - say, ekwtamil99uni (at https://github.com/keymanapp/keyboards/tree/master/release/e/ekwtamil99uni).
4. Use Keyboards > ekwtamil99uni.kmn > Build > Compile Keyboard and verify that no errors are emitted.
5. Returning to the .kpj overview, use Packaging > ekwtamil99uni.kps > Build > Compile Package and verify that no errors are emitted.

TEST_DEVELOPER_SERVER: Using the test build of Keyman Developer, verify that the Web test-host page works properly for testing Web keyboards.

1. Open Keyman Developer.
2. Open any keyboard project - say, ekwtamil99uni (at https://github.com/keymanapp/keyboards/tree/master/release/e/ekwtamil99uni).
3. Use Keyboards > ekwtamil99uni.kmn > Build > Compile Keyboard and verify that no errors are emitted.
4. From the same screen, click "Test Keyboard on web", then "Open in browser".
5. Verify that the keyboard can be selected and that it loads and types properly.

[keymanapp-test-bot]

User Test Results

Test specification and instructions

• ✅ TEST_DEVELOPER_KMC (PASSED): I tested this issue with the attached "Keyman 18.0.30-alpha-test-11464" build on the Windows 11 OS environment: Here is my observation. (notes)
• ✅ TEST_DEVELOPER_SERVER (PASSED) (notes)

Test Artifacts

• Android
  • Keyman for Android apk
  • FirstVoices for Android 16.0 apk
  • FirstVoices Keyboards for Android apk
  • KeyboardHarness apk
  • Keyman for Android 16.0 apk
  • KMSample1 apk
  • KMSample2 apk
• Developer
  • Keyman Developer
  • Compiler Regression Tests
  • kmcomp.zip
• iOS
  • Keyman for iOS (simulator image)
  • FirstVoices Keyboards for iOS (simulator image)
  • TestFlight internal PR build version - 18.0.45 (0.11464.11144)
• Keyboards
  • Test Keyboards
• Web
  • KeymanWeb Test Home
• Windows
  • Keyman for Windows
  • FirstVoices Keyboards for Windows
  • Text Editor (32 bit)
  • Text Editor (64 bit)

[mcdurdin]

Can you include a reference for why this is being done?

[dinakaranr]

Test Results

• TEST_DEVELOPER_KMC (PASSED): I tested this issue with the attached "Keyman 18.0.30-alpha-test-11464" build on the Windows 11 OS environment: Here is my observation.

1. Get the latest changes in the keyboard repository and then ran ./build.sh clean on the "git bash prompt" window.
2. Open Keyman Developer.
3. Open the "ekwtamil99uni" keyboard project from the keyboards release folder. 
4. Use Keyboards > ekwtamil99uni.kmn > Build > Compile the keyboard, and then verify that no errors appeared after compilation was completed.
5. Navigate and return to the.kpj overview tab. Click on the Packaging tab.
6. Click "ekwtamil99uni.kps".
7. On the Build tab, click "Compile Package."
   Here, verify that no error appeared after the compilation was completed. "ekwtamil99uni.kmn built successfully." message appeared in green color. It works well. Thanks.

• TEST_DEVELOPER_SERVER (PASSED):

1. Open Keyman Developer.
2. Open the "ekwtamil99uni" keyboard project from the keyboards release folder. 
3. Use Keyboards > ekwtamil99uni.kmn > Build > Compile the keyboard, and then verify that no errors appeared after compilation was completed.
4. On the "Android and iOS Targets" pane: click the "Test package on Web" button. Here, a QR quote appeared. The web address appeared in the server list box.
5. Select the "http://localhost:8008" address and then click the "Open in browser" button.
6. A browser window appeared with the web keyboard. Here, the keyboard is loaded on the browser.
7. Select "ekwtamil99uni" from the "keyboard" list box.
8. Click some keys on Web-OSK. Here, Tamil keys appeared in the "character-grid" window. It works well. Thanks.

[keyman-server]

Changes in this pull request will be available for download in Keyman version 18.0.47-alpha