* Hide camera controls when switching to TEXT.
* Streamline camera capture session state tracking.
Stop camera when switching to TEXT.
* Basic text story composer.
All UI works, but needs fine-tuning and tapping on Next (->) doesn't do anything.
* Run auto-genstrings.
* Adjust text size and alignment as user enters text.
1..49 characters: 34 pt, center-aligned.
50..199 characters: 24 pt, center-aligned.
200.. characters: 18 pt, natural alignment.
* Change default text color in text story composer to white.
* Added support for changing background of text story composer.
Selection is allowed from palette of 5 gradients and 11 solid colors.
* Improve vertical alignment of text in text story composer.
Text (and possible link preview panel in the future) should be vertically
centered in the area above either bottom controls or onscreen keyboard.
* Add UI for attaching a link preview to a text story.
* Add support for posting text stories.
* Lint.