feat(app): tab bar & related design changes (#1181)

Introduces the new tab bar for mobile UI. For desktop, more prep work is
needed, so we keep the old design for now.
This PR includes a number of related UX/UI changes:
 - New navigation for the profile screen
 - Small design changes to the chat list and the profile screen
- Using the new design system tokens as a trial in
`navigation_tokens.dart`
 - Introducing `GlassCircleButton` and using it throughout the UI
 - New breakpoint for responsive design
 - Adding a scrim to iOS transitions
 - New golden for the app bar

As a result of all the design changes, a lot of goldens have to be
regenerated.

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: boxdot <dimitri@phnx.im>

feat(server): add RUST_LOG_FORMAT config env var (#1159)

Extracted from #1143

Defaults to `json` to avoid breaking backwards compatibility, and can be
set to `text` (or any other value).

fix(app): cursor for links (#1113)

fix(app): follow up tweaks (#1061)

Follow-up to #1048:
 - Adjust font sizes
- Hide the 'Sending' label while the message status indicator is not
visible

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

chore: v0.11.1

fix(app): provider not found error when switching users/logout (#1022)

This commit introduces another state in `LodableUser` that represents
the user being unloaded. This allows keeping the `User` object, and
therefore the cubits attached to it, for the duration of the transition
to the intro page after the user logs out.

This also allows switching users without actually navigating to the
intro page, which avoids flickering. For that, however, the root cubits
and the chat list cubit are attached to the user id of the loaded user.

feat(app): jumbo emojis (#1000)

Show text messages that contain only emojis differently: no background
bubble & larger font size.

This PR also fixes the following issues in tests:
 - Emojis were not shown in goldens
 - Fonts that were not used in the app were still bundled and loaded

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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

fix(app): multiple contact requests per username (#970)

Fixes a bug where multiple contact requests for the same username would
partially overwrite each other, and also fixes a logging issue.

The new test previously failed without the fix.

fix(app): added user system message was not immediately visible (#958)

The store notified about a new message before the messages was committed
in the database transaction.

Version 0.7.0