Add "error" Page for special accounts in Mobile

[HansiWursti]

Hello,

if you access the mobile view from a "special" account url the website crashes:

/accounts/budgeted
/accounts/offbudget
/accounts/uncategorized

To recreate resize your browser while accessing one of the mentioned urls.

The Problem in my opinion is that these accounts not really exist and so account is later undefined and not able to be queried for the balance etc.

My simple fix is a little "error" page with a button back to the Accounts Overview:

Thank you

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[github-actions]

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Files count	Total bundle size	% Changed
16	3.09 MB → 3.09 MB (+366 B)	+0.01%

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File	Δ	Size
src/components/accounts/MobileAccount.jsx	📈 +1.02 kB (+15.03%)	6.79 kB → 7.81 kB

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static/js/narrow-components.chunk.js	51.17 kB → 51.52 kB (+366 B)	+0.70%

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static/js/main.js	1.26 MB	0%
static/js/665.chunk.js	824.28 kB	0%
static/media/Inter-italic.var.woff2	239.29 kB	0%
static/media/Inter-roman.var.woff2	221.86 kB	0%
static/js/444.chunk.js	156.11 kB	0%
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static/js/wide-components.chunk.js	114.99 kB	0%
static/js/reports.chunk.js	77.3 kB	0%
static/js/553.chunk.js	28.94 kB	0%
static/js/473.chunk.js	13 kB	0%
static/js/resize-observer-polyfill.chunk.js	8.88 kB	0%
static/css/main.css	7.41 kB	0%
asset-manifest.json	2.07 kB	0%
index.html	1.66 kB	0%
static/media/browser-server.js	911 B	0%

[github-actions]

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2	2.23 MB	0%

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[twk3]

Thanks @HansiWursti !

This looks like a good improvement, to prevent crashes if someone re-orients their mobile after being on one of these pages.

The desired followup would be #757 to actually implement these pages. But preventing crashes is a good first step.

[twk3]

@HansiWursti can you open a new PR with this change. I merged it too early without confirming it worked with the other changes in master, and we had to revert it.