fix(ApiClient): respect force flag in init() to allow customServerUrl reload

[VBoucher]

Problem

When a user changes the Server URL via login settings, the new URL is persisted to Capacitor Preferences but is not picked up by the API client until the app is force-stopped and reopened.

This results in confusing UX: the user updates their self-hosted server URL, taps Save, then attempts to log in — and gets Login Failed because the request is still being sent to the previous URL (e.g. the default API_URL).

Root cause

ApiClient.init(force) accepts a force flag intended to bypass the cached state and re-read customServerUrl from Preferences. However, the first check in the function returns the existing initPromise whenever it is set, regardless of whether force is true:

async init(force = false) {
  if (this.initPromise) {        // ← returns stale promise even when force=true
    return this.initPromise
  }
  if (this.initialized && !force) {
    return Promise.resolve()
  }
  this.initPromise = this._doInit()
  return this.initPromise
}

After the first init, initPromise is a resolved promise that resolves with the original URL. Calling init(true) from LoginSettings.jsx after the user updates the server URL returns this same resolved promise without ever invoking _doInit() again — so customServerURL is never updated and subsequent requests keep going to the old URL.

Fix

Reset initPromise and initialized at the top of init() when force=true, so the subsequent checks fall through and _doInit() is invoked again to re-read Preferences.

Reproduction

1. Open the app on a device with customServerUrl previously set to default (or empty)
2. Go to login settings, change the server URL to a self-hosted URL, tap Save
3. Try to log in
4. Observe: request is sent to the original URL, login fails
5. Force-stop and reopen the app — login now works

After this fix, step 4 succeeds without needing to force-stop.

Diff

src/utils/ApiClient.js: +5 / -1 lines.

[VBoucher]

Note: this code was done by Claude Code. Review is necessary.