[feature]: Independent column resizing in timeline view for better readability

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Summary

I have the self-hosted version of Plane available.
As a Project Manager, I often need to turn to Plane's Timeline view to see what tasks I have scheduled for my team till what date.
However, whenever I open the view, it does show me the task as a bar, but fails to let me expand the date slot by dragging it. Currently, long task titles are truncated because the timeline slots are too narrow. I try to do this because at times, the title of the work item is a little big, and it gets cut off. If I try to hold the bar, and drag it, it simply increases the time duration of the work item. This feels a little unintuitive, as I would ordinarily like to use it like I would do Excel cells - simply drag them to increase their length, and let me view more of what the title of the work item is.

I would like a way to adjust the visual width of the timeline columns. Dragging the boundary of a date should increase its visual width across the entire view.

Why should this be worked on?

Reduces Accidental Data Entry: Currently, the only way to "see more" of a task title is to drag the bar, which changes the task's duration. This leads to accidental scheduling errors that Project Managers then have to manually revert.

Improves High-Level Planning: PMs use the Timeline view for "at-a-glance" reporting. If task titles are truncated (e.g., "Implement API for..." vs. "Implement API for User Auth"), the view becomes unreadable, forcing the user to click into every single task.

Standardizes UI Expectations: Users accustomed to Excel, Google Sheets, or MS Project expect "Column Resizing" as a core table/timeline behavior. Bringing this to Plane aligns the tool with industry-standard UX patterns.

Support for Long-Form Work Items: In professional software environments, task names are often descriptive and long. The current fixed-width constraint limits Plane’s utility for complex projects with detailed naming conventions.