feat: symbol bar (#1317)

* feat: symbol bar

* feat: add symbols

* style: symbol bar

* feat: adjust bottom bar height and visibility based on keyboard state

* fix: constrain progress indicator size

* feat: update app bar to use preferred size based on panel visibility

* refactor: simplify app bar visibility logic and remove unused properties

* fix: make sure scroll indicator disappears when reaching max scroll extend

* chore: update phone_ide dependency to version 1.3.0 and change source to hosted