feat: add dual-focus navigation with interactive action execution

[utkarsh232005]

Summary

Fixes the issue where actions on the Dashboard (and all other screens) were rendered as static text with no way to select or execute them.

Changes

1. state.rs:
   • Added FocusPane enum (Sidebar, Main).
   • Added focus and selected_action index to UiState.
   • Added helper methods for navigating actions and retrieving available actions for the current screen.
2. dashboard.rs:
   • Added render_action_list widget helper that displays actions with focus-aware borders, keyboard hints, and visual active indicators.
   • Updated render_settings and render_deployments to split screens and include the new interactive action list.
   • Updated handle_key to support dual-focus navigation:
     • Tab / BackTab and Left / Right arrow keys switch focus between Sidebar and Main panel.
     • Up / Down arrows navigate the action list when the main panel is focused.
     • Enter key executes the selected action when the main panel is focused.
3. palette.rs:
   • Added actions_for_screen helper to filter actions by screen.

Verification

• Built with cargo build.
• Ran unit tests with cargo test (all 130 tests pass).

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ℹ️ Review info

⚙️ Run configuration

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Run ID: ec4b6887-32bd-4c74-a387-a43ce18b5dbf

📥 Commits

Reviewing files that changed from the base of the PR and between 8e71a8e and ba7bf2f.

📒 Files selected for processing (4)

• src/ui/dashboard.rs
• src/ui/mod.rs
• src/ui/state.rs
• src/ui/welcome.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

❌ Patch coverage is 57.61421% with 167 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/ui/dashboard.rs	27.27%	136 Missing ⚠️
src/ui/welcome.rs	91.09%	17 Missing ⚠️
src/ui/state.rs	12.50%	14 Missing ⚠️

📢 Thoughts on this report? Let us know!

[codescene-delta-analysis]

Code Health Improved (1 files improve in Code Health)

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Gates Passed
3 Quality Gates Passed

View Improvements

File	Code Health Impact	Categories Improved
dashboard.rs	8.68 → 8.96	Complex Method, Bumpy Road Ahead, Deep, Nested Complexity, Excess Number of Function Arguments

Quality Gate Profile: The Bare Minimum
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