Fix unused handle mouse function, pub mod appstate and some clippy warnings

[jeevithakannan2]

Type of Change

• Refactoring

Description

• Fix unnecessary usage of pub mod appstate and unused float handle mouse function.
• Fix the below clippy warnings with new rust version.

warning: the following explicit lifetimes could be elided: 'a
   --> tui/src/floating_text.rs:174:6
    |
174 | impl<'a> FloatContent for FloatingText<'a> {
    |      ^^                                ^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
    = note: `#[warn(clippy::needless_lifetimes)]` on by default
help: elide the lifetimes
    |
174 - impl<'a> FloatContent for FloatingText<'a> {
174 + impl FloatContent for FloatingText<'_> {
    |

warning: manually reimplementing `div_ceil`
  --> tui/src/hint.rs:39:16
   |
39 |     let rows = (shortcut_spans.len() + columns - 1) / columns;
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.div_ceil()`: `shortcut_spans.len().div_ceil(columns)`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_div_ceil
   = note: `#[warn(clippy::manual_div_ceil)]` on by default

warning: `linutil_tui` (bin "linutil") generated 2 warnings (run `cargo clippy --fix --bin "linutil"` to apply 2 suggestions)

Testing

• Tested on arch linux without any issues.

Checklist

• My code adheres to the coding and style guidelines of the project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no errors/warnings/merge conflicts.