Make e-ink a responsive theme and disable UI motion

[Eoic]

Summary

Selecting e-ink previously forced mobile navigation even on large screens. E-ink now behaves as a theme: the current route and screen-width layout stay intact, while controls use stronger monochrome contrast and borders.

• Apply a shared motion policy to overlays, navigation, charts, loading indicators, image fades, and interactive controls. Preserve keyboard focus and actual progress updates.
• Use static calendar controls and instant drawer transitions where Flutter's built-in animations cannot be disabled through the theme.
• Keep input labels above fields, snap focus borders between states, and remove hint fades. Preserve native text, selection, focus, and validation; light and dark retain their normal animations.
• Remove the separate e-ink navigation shell and old e-ink-only sizing overrides. Document the theme and motion helpers.

Testing

Completed locally:

• flutter test --no-pub: 1,145 passed, 10 skipped.
• flutter analyze --no-pub: no issues.
• flutter build web --release --no-pub: succeeded.
• git diff --check: passed.

Regression coverage includes layouts at 390, 850, and 1440 pixels; theme changes during animations; overlays; date and range selection; drawers; rendered toggle states; repeated keyboard interaction; and pixel comparisons of input focus/blur.

To review manually, switch between light, dark, and e-ink at phone and desktop widths. Check that navigation stays in place, then open dialogs/drawers, edit dates, toggle controls, and focus/blur text fields. Confirm e-ink transitions snap while light/dark still animate.

UI evidence

No screenshots attached. Automated layout and rendered-pixel checks are included in app/test/themes/ and app/test/widgets/.

Compatibility and migration

No data migrations or dependency changes. Existing theme preferences remain supported.

Notes

See app/docs/eink-theme.md for the shared motion helpers and conventions for future UI additions.

Checklist

• The branch, commits, and pull request title follow the repository conventions.
• The change is complete and limited to the ticket's scope.
• Relevant tests have been added or updated.
• Formatting, analysis, and tests pass.
• Documentation, UI evidence, and migration notes are included where relevant.
• No credentials, personal data, copyrighted fixtures, or unrelated generated files are included.
• The branch is up to date with its target branch.

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