feat: use distinct icons for Close file and Discard actions

[k1LoW]

Summary

• Use stroke-based icons (matching other toolbar buttons) instead of filled Octicons for the Close/Discard button
• Close file (local files): document icon with fold corner and × in the bottom-right, extending beyond the document boundary
• Discard (drag-and-dropped files): trash can icon
• Both CloseFileButton and FileContextMenu updated consistently

[Copilot]

Pull request overview

This PR updates the frontend UI to use distinct stroke-based icons for file removal actions, differentiating Close file (local files) from Discard (drag-and-dropped/uploaded files), and applies the change consistently across toolbar and context menu.

Changes:

• Added a new RemoveIcon component that renders either a document-with-× icon or a trash icon depending on uploaded.
• Updated CloseFileButton to use RemoveIcon instead of an embedded filled Octicon.
• Updated FileContextMenu to use RemoveIcon for the Close/Discard menu item.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
internal/frontend/src/components/RemoveIcon.tsx	Introduces a reusable stroke-based icon component for Close vs Discard variants.
internal/frontend/src/components/FileContextMenu.tsx	Replaces the filled remove icon with RemoveIcon and keeps Close/Discard labeling.
internal/frontend/src/components/CloseFileButton.tsx	Replaces the filled remove icon with RemoveIcon in the toolbar close/discard button.

[github-actions]

Code Metrics Report

	main (75782b9)	#161 (a99640d)	+/-
Coverage	57.1%	57.1%	-0.1%
Code to Test Ratio	1:0.5	1:0.5	-0.1
Test Execution Time	31s	31s	0s

Details

  |                     | main (75782b9) | #161 (a99640d) |  +/-  |
  |---------------------|----------------|----------------|-------|
- | Coverage            |          57.1% |          57.1% | -0.1% |
  |   Files             |             40 |             41 |    +1 |
  |   Lines             |           3538 |           3539 |    +1 |
  |   Covered           |           2023 |           2023 |     0 |
- | Code to Test Ratio  |          1:0.5 |          1:0.5 |  -0.1 |
  |   Code              |           5686 |           5717 |   +31 |
  |   Test              |           2961 |           2961 |     0 |
  | Test Execution Time |            31s |            31s |    0s |

Code coverage of files in pull request scope (18.1% → 16.6%)

Files	Coverage	+/-	Status
internal/frontend/src/components/CloseFileButton.tsx	0.0%	0.0%	modified
internal/frontend/src/components/FileContextMenu.tsx	20.0%	0.0%	modified
internal/frontend/src/components/RemoveIcon.tsx	0.0%	0.0%	added

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Reported by octocov

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.