Fix/agentflow - Fixes for minor UI issues in extracted canvas

[j-sanaa]

JIRA - FLOWISE-499, FLOWISE-496, FLOWISE-500, FLOWISE-502, FLOWISE-473

• FIxed edit button styling and color to be similar to v2

• Fixed all input fields to have same width

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• Removed redundant line appearing below model parameters:

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• Fix edit button being more greyed out

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[gemini-code-assist]

Code Review

This pull request improves UI layout by adding horizontal padding to action buttons in the ConditionBuilder, MessagesInput, and StructuredOutputBuilder components. It also expands the theme configuration with detailed color palettes and global MuiPaper overrides. A review comment identifies a visual inconsistency in the primary color palette where the main cyan color conflicts with its blue light and dark variants.