File links with line ranges in agent replies don't jump to correct lines when opened

[bobleer]

Description:
When clicking on file links with line number ranges (format like filename.ts:42-50 or filename.ts#L42-L50) in agent chat replies, the file opens in the viewer but doesn't automatically scroll to or highlight the specified lines.

Steps to Reproduce:

1. Have an agent generate a reply that includes file links with line numbers
2. Click on such a link (e.g., [CodeEditor.tsx:924-1028](src/web-ui/src/tools/editor/components/CodeEditor.tsx#L924-L1028))
3. Observe the file opens but stays at the top without scrolling/jumping

Expected Behavior:
The file viewer should automatically scroll to and highlight the specified line range when the file is opened via a link.

Technical Details:

• File links are parsed in Markdown.tsx (lines 434-457) using parseLineRange()
• The line range is passed to handleFileViewRequest() (line 474)
• FileTabManager.ts receives jumpToRange parameter when opening files
• CodeEditor.tsx has the jump logic in lines 924-1028, using jumpToRange prop
• The jump effect may be firing before the file content is fully loaded or the editor is ready

Files Involved:

• src/web-ui/src/component-library/components/Markdown/Markdown.tsx - link parsing and handling
• src/web-ui/src/flow_chat/components/modern/useFlowChatFileActions.ts - file view request handler
• src/web-ui/src/shared/services/FileTabManager.ts - tab management with jumpToRange
• src/web-ui/src/tools/editor/components/CodeEditor.tsx - jump implementation (lines 924-1028)