[FEATURE] Shift-click range selection for timeline clips

[oguzhancttnky]

Problem

Timeline clips currently do not support Shift-click range selection within the same row.

Expected workflow:

1. Click the first clip in a row
2. Hold Shift
3. Click another clip in the same row
4. All clips between them are selected

Solution

Add Shift-click range selection for timeline clips on the same row.

The behavior should:

• Use the first clicked clip as the range anchor
• On Shift-click, select every clip between the anchor and target clip in that same row
• Preserve the existing Ctrl/Cmd-click toggle selection behavior

I have a small implementation

Alternative

The current alternatives are Ctrl/Cmd-clicking each clip individually.

Anything else?

No response