Build/add tests to mobile

[moodyjmz]

As per https://github.com/Euro-Office/fork/issues/58

There is a fair amount of detail there.

Essentially a limited PoC to see what is required to test mobile code.

309 tests across 23 test files

By layer

┌───────────────────┬───────┬───────────────────────────────────────────────────────────────────────────────────────────┐                         
│       Layer       │ Tests │                                      What's covered                                       │                         
├───────────────────┼───────┼───────────────────────────────────────────────────────────────────────────────────────────┤
│ Pure logic (lib/) │ 118   │ Extracted Main.jsx modules, editor helpers, init functions                                │
├───────────────────┼───────┼───────────────────────────────────────────────────────────────────────────────────────────┤
│ Stores            │ 106   │ focusObjects (doc+pres), textSettings, cellSettings, shapeSettings, sheets, slideSettings │
├───────────────────┼───────┼───────────────────────────────────────────────────────────────────────────────────────────┤
│ Controllers       │ 33    │ EditText, Toolbar                                                                         │
├───────────────────┼───────┼───────────────────────────────────────────────────────────────────────────────────────────┤
│ Views             │ 28    │ Toolbar, EditText                                                                         │
├───────────────────┼───────┼───────────────────────────────────────────────────────────────────────────────────────────┤
│ Infrastructure    │ 24    │ SDK adapter, SvgIcon, HighlightColorPalette                                               │
└───────────────────┴───────┴───────────────────────────────────────────────────────────────────────────────────────────┘

By editor

  ┌─────────────────┬───────┐
  │     Editor      │ Tests │
  ├─────────────────┼───────┤
  │ Common (shared) │ 24    │
  ├─────────────────┼───────┤
  │ Document        │ 189   │
  ├─────────────────┼───────┤
  │ Spreadsheet     │ 45    │
  ├─────────────────┼───────┤
  │ Presentation    │ 51    │
  └─────────────────┴───────┘

Strengths

• Phase 6 (see issue linked) extractions are thoroughly tested — every branch of protection, licensing, download format, metric settings logic has coverage
• Store reactivity is validated — observable state, computed properties, action methods
• Cross-editor patterns established — spreadsheet and presentation stores follow the same testing pattern as document editor

Gaps

• No controller integration tests — controllers are tested in isolation with mocked APIs, no end-to-end callback flows
• No Main.jsx tests — the biggest file (~1600 lines) has zero direct tests; only the extracted modules are covered
• No LongActions, Search, ContextMenu coverage
• Most stores untested — imageSettings, chartSettings, shapeSettings (doc), appOptions, documentInfo
• View tests are shallow — verify rendering and props, not user interaction flows

Quality

The tests we wrote are solid — they test real logic, not implementation details. The extracted pure functions are the highest-value targets
because they're decision logic that's hard to verify by eye. The main risk is everything around what we tested.

[moodyjmz]

I put this as draft as I think some other changes need to go through first.