Fix 2026.03-LTS post-merge dashboard and accounts crashes.

[rmanacmol]

Restore the /api suffix on DBS apiRoot so workspace and accounts calls succeed after login, and map dropped Design System 9 color tokens so account list inflation no longer crashes.

Summary

Follow-up to #51 (2026.03-LTS upgrade on main). Login still worked, but post-login navigation and the accounts list were broken.

Two upgrade gaps:

1. API root — MSDK 15 removed experienceConfiguration.apiRoot (serverUrl + "/api"). We pointed COMMON_API_ROOT_QUALIFIER at configuration.serverUrl and dropped the /api suffix. Workspace/accounts DBS calls went to https://app.../access-control instead of .../api/access-control, so the dashboard never loaded.
2. Design System 9 tokens — Custom accounts layouts still used ?colorOnSurfaceSecondary and ?textAppearanceCaption. Those are not assigned on Theme.Backbase.Fullscreen / DS 9, so inflating account_list_header crashed (Failed to resolve attribute colorTextSupport).

Changes

• Restore /api on apiRoot() in AppModule.kt
• Map colorTextSupport / colorOnSurfaceSecondary on AppTheme
• Point accounts list/detail secondary text at DS 9-safe colors (@color/bds_textSupport, textAppearanceBody2)

Screen_recording_20260904_115157.webm

Test plan

• Run app against dev sandbox (correct keystore / facet ID)
• Login succeeds
• Workspace selector completes and dashboard is shown
• Accounts list renders (no inflate crash)
• Account detail opens