feat(ui): add interactive keybinding editor to settings menu

[sansitachaudhury]

Description

added a interactive keybinding editor sub menu in settings tab which will allow users to rebind all application control hotkeys dynamically from TUI interface & remove the need to manually edit the config.toml file

Fixes # (issue #59 )

Type of Change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Manual test (please describe): launched TUI with cargo run moved to settings tab then verified that both arrow keys and the mouse scroll down through keybinding options. Then I triggered a rebind using Enter and also confirmed the config wrote to config.toml

• cargo test

Checklist:

• My code follows the Coding Guidelines.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have NOT added useless AI-generated comments.
• I have NOT deleted existing unrelated comments.
• I have NOT modified files unrelated to this task.
• I have included screenshots/recordings (for UI changes).
• My changes generate no new warnings (clippy/fmt).
• I have linked the issue I am working on.

Screenshots (if applicable)

[vercel]

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[pie-314]

@sansitachaudhury Screenshot/screen recording is applicable

[sansitachaudhury]

@pie-314 I have updated with screenshot

[pie-314]

@sansitachaudhury

Few issues

• it's not scrolling
• it's rendering half
• UI looks bad

I suggest you to use other side of screen for editing keybinds or a popup menu

[sansitachaudhury]

this is the improvement from the previous one
made the UI look clean and it's scrolling

[pie-314]

@sansitachaudhury It looks good i suggest you to use right side of screen for better visibility, at the same time scroll is not working properly neither arrows keys are going to bottom two options.