[Bug]: Timeline minimap hover target extends into text content area at non-default zoom levels

[chrisdeeming]

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/desktop

Steps to reproduce

1. Open a long conversation thread so the timeline minimap is visible in the left gutter.
2. Zoom in with Cmd+Plus around 4-5 times.
3. Hover over message text that's nowhere near the gutter.

Expected behavior

The minimap hover target should stay scoped to the gutter/dash area regardless of zoom level; it shouldn't bleed into the text content region.

Actual behavior

The minimap's popover preview activates even though the cursor is visibly over body text, not the gutter — see attached screenshot (cursor is circled, clearly over the paragraph text, not the dash markers).

The main issue this caused for me was the "Copy" button next to the message timestamp disappears because it thinks I'm hovering over the gutter, so I can't use the button. Highlighting text is also tricky when the start/end region is covered by the timeline.

Impact

Major degradation or frequent failure

Version or commit

0.0.29-nightly.20260705.729 (6009720)

Environment

macOS 26.5

Logs or stack traces

Screenshots, recordings, or supporting files

No response

Workaround

Basically just highlight whatever you can with the mouse and use Shift + Arrow keys to highlight the rest. (Or reset to actual size)