Fix UI/UX inconsistencies and premium terminal enhancements (#104)

[tanmayythakare]

Summary

This PR resolves Issue #104 by fixing multiple UI/UX inconsistencies and improving overall polish while preserving DevShell’s existing design language.

Changes Made

Sidebar Improvements

• Fixed sidebar category overlap and rendering inconsistencies
• Improved category alignment and spacing

Terminal Tab Improvements

• Fixed sequential tab numbering after closing/restoring tabs
• Improved active tab styling and visual hierarchy
• Added terminal execution status indicators
• Refined tab spacing and interactions

Modal & Input Improvements

• Styled modal input fields to match the dark theme
• Replaced native browser confirmation dialogs with themed in-app confirmations

UI Enhancements

• Added collapsible sidebar support
• Added terminal font scaling controls (A+ / A-)
• Improved dropdown styling for better visual consistency

Analytics Improvements

• Fixed pluralization (1 run vs 1 runs)
• Improved analytics presentation and execution feedback

Testing & Validation

Manually verified:

• Sidebar rendering consistency
• Sequential terminal numbering
• Session restore behavior
• Modal and confirmation flow
• Analytics rendering
• Sidebar collapse/expand
• Terminal font scaling

Additionally verified:

• pytest passes successfully
• No breaking changes introduced

UI Preview

Below are some previews of the UI/UX refinements included in this PR.

Terminal UI & Delete Button Improvement

Analytics Dashboard Improvements

Sidebar & Overall UX Refinements

Fixes #104

[siddu-k]

@tanmayythakare conflicts that must be resolved

[siddu-k]

@tanmayythakare can u fix the conflit