feat: align border control with spacing split-mode inputs

[SmrutiSawant]

Replaced the individual border properties with a unified BorderControl component that supports splitting the border width inputs into T(top), R(right), B(bottom), L(left) side inputs (matching the existing Spacing and Border Radius fields layout)

[greptile-apps]

Confidence Score: 4/5

Safe to merge; the change is additive and the core split-mode wiring is correct.

The split-mode integration and color-event cleanup logic are sound. The only difference from the original behavior is that Border Style becomes visible when borderWidth is set without a borderColor, which is a minor UX edge case rather than a data-corrupting bug.

frontend/src/components/BorderControl.vue — specifically the hasColor computed property condition.

_{Reviews (1): Last reviewed commit: "feat: align border control with spacing ..." | Re-trigger Greptile}

[surajshetty3416]

@SmrutiSawant always better to add screenshots/video to demonstrate the change

[SmrutiSawant]

Screen recording demonstrating the new unified Border properties and the split-mode width inputs
Before :

Before.mp4

After:

after.mp4

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