Add accessibilityIdentifier strings to all interactive UI elements

[mobilinkd]

Add accessibilityIdentifier to every interactive UI element in the storyboard and Swift code so XCUITest can locate them reliably.

Required identifiers

Every button, table, cell, slider, picker, toggle, and label that XCUITest needs to interact with or assert on must have a unique accessibilityIdentifier.

See the full identifier mapping in the XCUITest automation plan (#12).

Acceptance criteria

• All interactive elements in Main.storyboard have accessibilityIdentifier set
• All custom cell classes set identifiers in awakeFromNib or cellForRowAt
• No duplicate identifiers within a single screen
• Identifiers follow consistent naming (camelCase, descriptive)

Parent: #12