Improve messaging when the API fails to download a file

[j-f1]

See #1394.

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[github-actions]

Bundle Stats - desktop-client

Hey there, this message comes from a GitHub action that helps you and reviewers to understand how these changes affect the size of this project's bundle.

As this PR is updated, I'll keep you updated on how the bundle size is impacted.

Total

Files count	Total bundle size	% Changed
16	2.08 MB -> 2.08 MB (+14 B)	+0.00%

Changeset

File	Δ	Size
../loot-core/src/shared/errors.ts	📈 +27 B (+0.93%)	2.83 KB -> 2.85 KB

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Asset	File Size	% Changed
static/js/main.js	858.3 KB -> 858.31 KB (+14 B)	+0.00%

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Asset	File Size	% Changed
static/js/457.chunk.js	388.22 KB	0%
static/media/Inter-italic.var.woff2	239.29 KB	0%
static/media/Inter-roman.var.woff2	221.86 KB	0%
static/js/wide-components.chunk.js	156.7 KB	0%
static/js/383.chunk.js	117.35 KB	0%
static/js/reports.chunk.js	32.35 KB	0%
static/js/narrow-components.chunk.js	32.15 KB	0%
static/js/281.chunk.js	28.55 KB	0%
static/js/876.chunk.js	26.2 KB	0%
static/js/969.chunk.js	12.94 KB	0%
static/js/resize-observer-polyfill.chunk.js	8.12 KB	0%
static/css/main.css	5.82 KB	0%
asset-manifest.json	2.07 KB	0%
index.html	1.66 KB	0%
static/media/browser-server.js	963 B	0%

[github-actions]

Bundle Stats - loot-core

Hey there, this message comes from a GitHub action that helps you and reviewers to understand how these changes affect the size of this project's bundle.

As this PR is updated, I'll keep you updated on how the bundle size is impacted.

Total

Files count	Total bundle size	% Changed
2	1.97 MB -> 1.97 MB (+56 B)	+0.00%

Changeset

File	Δ	Size
packages/loot-core/src/shared/errors.ts	📈 +29 B (+0.89%)	3.18 KB -> 3.21 KB
packages/loot-core/src/server/api.ts	📈 +55 B (+0.35%)	15.46 KB -> 15.51 KB

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Asset	File Size	% Changed
kcab.worker.js	1009.32 KB -> 1009.38 KB (+56 B)	+0.01%

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Asset	File Size	% Changed
xfo.xfo.kcab.worker.js	1004.04 KB	0%