feat: DIA-1783, DIA-1794: [FE] Prep work - Tailwind + shadcn cross integration in LSO + LSE

[nick-skriabin]

Brings Tailwind and Shadcn as a new standard.

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

(link to issue, supportive screenshots etc.)

What does this fix?

(if this is a bug fix)

What is the new behavior?

(if this is a breaking or feature change)

What is the current behavior?

(if this is a breaking or feature change)

What libraries were added/updated?

(list all with version changes)

Does this change affect performance?

(if so describe the impacts positive or negative)

Does this change affect security?

(if so describe the impacts positive or negative)

What alternative approaches were there?

(briefly list any if applicable)

What feature flags were used to cover this change?

(briefly list any if applicable)

Does this PR introduce a breaking change?

(check only one)

• Yes, and covered entirely by feature flag(s)
• Yes, and covered partially by feature flag(s)
• No
• Not sure (briefly explain the situation below)

What level of testing was included in the change?

(check all that apply)

• e2e
• integration
• unit

Which logical domain(s) does this change affect?

(for bug fixes/features, be as precise as possible. ex. Authentication, Annotation History, Review Stream etc.)

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✅ Deploy Preview for label-studio-docs-new-theme canceled.

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 77.06%. Comparing base (8ce1109) to head (2a435a7).
Report is 5 commits behind head on develop.

Files with missing lines	Patch %	Lines
label_studio/core/views.py	33.33%	4 Missing ⚠️
label_studio/users/views.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7009      +/-   ##
===========================================
- Coverage    77.09%   77.06%   -0.03%     
===========================================
  Files          183      183              
  Lines        14406    14413       +7     
===========================================
+ Hits         11106    11108       +2     
- Misses        3300     3305       +5     

Flag	Coverage Δ
pytests	77.06% <50.00%> (-0.03%)	⬇️

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[nick-skriabin]

/git merge

Workflow run
Error: Workflow failed

[nick-skriabin]

/docker build

Workflow run
Docker image was pushed with the tag 20250221.173814-fb-dia-1783-tailwind-next-2a435a726

[nick-skriabin]

/docker build

Workflow run
Docker image was pushed with the tag 20250226.164529-fb-dia-1783-tailwind-next-3bb07c7d1