fix(tui): implement dynamic text-wrapping in observation detail view

[Twinber]

fix(tui): Implement dynamic soft-wrapping in observation detail view

Summary

Improved the readability of the TUI by implementing dynamic text wrapping for observation content. This ensures that long lines (prompts, logs, or detailed notes) are fully visible regardless of the terminal window size.

• Dynamic Wrapping: Content is now wrapped using Lipgloss based on terminal width before pagination.
• Robust Scrolling: The scroll/pagination logic was updated to work with the multi-line wrapped content accurately.
• Verification Suite: Introduced a new unit test to ensure wrapping logic remains consistent in future updates.

Motivation

Previously, long observations were truncated at the viewport boundaries, making it impossible to read the full content without side-scrolling. This change addresses a long-standing readability issue and makes the TUI far more robust for technical documentation.

Closes #60
Closes #83

Changes

internal/tui/view.go

• Refactored viewObservationDetail to calculate a dynamic wrapWidth (terminal width minus padding).
• Applied detailContentStyle.Width(wrapWidth).Render(obs.Content) before splitting into lines.
• Updated the content rendering loop to handle the pre-rendered wrapped lines.

internal/tui/wrap_test.go [NEW]

• Added TestViewObservationDetailWrapping to programmatically verify that long content is correctly split into multiple lines when it exceeds the assigned width.

Validation

• Unit Testing: All internal/tui tests passed.
• New Test Case: TestViewObservationDetailWrapping confirms the fix.
• Manual TUI Check: Verified with high-density markdown content and varied terminal widths.