fix: OPTIC-849: style updates and tooltip edits

[carly-bartel]

PR fulfills these requirements

• Commit message(s) and PR title follows the format [fix|feat|ci|chore|doc]: TICKET-ID: Short description of change made ex. fix: DEV-XXXX: Removed inconsistent code usage causing intermittent errors
• Tests for the changes have been added/updated (for bug fixes/features)
• Docs have been added/updated (for bug fixes/features)
• Best efforts were made to ensure docs/code are concise and coherent (checked for spelling/grammatical errors, commented out code, debug logs etc.)
• Self-reviewed and ran all changes on a local instance (for bug fixes/features)

Change has impacts in these area(s)

(check all that apply)

• Product design
• Backend (Database)
• Backend (API)
• Frontend

Describe the reason for change

To better align the LabelStudio application with the HumanSignal design language, this PR introduces a broad change to styles in the following areas:

• Global app styles (Covers much of the general application components)
• Auth Views
  • Signin
  • Signup
  • Forms
• App
  • Button
  • Caption
  • HeidiTips
  • Modal
• App Views
  • Projects List
  • Create Project
  • Export
  • Project Settings
  • Annotation Settings
  • Machine Learning Settings
  • Webhooks
• Editor
  • Range
  • CurrentEntity
  • Timeline Controls
  • Choice
• DataManager
  • Range

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.73%. Comparing base (fd1b0ad) to head (f0aaf55).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #6055   +/-   ##
========================================
  Coverage    76.73%   76.73%           
========================================
  Files          168      168           
  Lines        13618    13618           
========================================
  Hits         10450    10450           
  Misses        3168     3168           

Flag	Coverage Δ
pytests	76.73% <ø> (ø)

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