Remove unnecessary and unhandled promise rejections

[kmichalikk]

The error overlay that appears on UI load is shown because of Promise.reject() or throw calls, which this PR removes.

• Promise.reject() in AuthService doesn't appear to serve any purpose so it's replaced with resolve()
• throw error in CustomStoppingPower is called when importing stopping file configs doesn't work - it is an implementation detail not to be shown to user, but I leave a console.log() to hopefully catch it
• throw new Error(err) in KeycloakProvider is never caught inside the component, so it is replaced with console.log()

[Copilot]

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (3)

src/util/keycloak/KeycloakProvider.tsx:25

• [nitpick] Consider including detailed error information (e.g., err.message) in the log to ensure consistency with error handling in other modules.

console.log('KeycloakAuthProvider:', err);

src/services/AuthService.tsx:337

• Replacing Promise.reject() with Promise.resolve() changes the control flow; please verify that downstream logic handles resolved promises in error cases appropriately.

return Promise.resolve();

src/ThreeEditor/Simulation/CustomStoppingPower/CustomStoppingPower.ts:33

• [nitpick] Consider including additional context (such as error codes or stack information) in the log to aid in debugging if necessary.

console.log(`Error while loading stopping power files: ${error.message}`);