Reset install state on dialog toggle and simplify UpdateDialog rendering

[myieye]

When closing the Update drawer (i.e. [only] on mobile) you currently get the error:

Uncaught TypeError: is not a function TypeError: opts.onAnimationEnd.current is not a function at http://localhost:5173/node_modules/.vite/deps/vaul-svelte.js?v=76104f81:1104:38

The reason is the fact that I wrapped the dialog/drawer in {#if open} to ensure state resets between openings.
Instead, we'll just manually reset all state.

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[github-actions]

UI unit Tests

  1 files  ±0   50 suites  ±0   24s ⏱️ -2s
138 tests ±0  138 ✅ ±0  0 💤 ±0  0 ❌ ±0 
203 runs  ±0  203 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 22adf31. ± Comparison against base commit d3a5b3e.

♻️ This comment has been updated with latest results.

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	Feb 26, 2026, 10:59 AM

[github-actions]

C# Unit Tests

160 tests  ±0   160 ✅ ±0   18s ⏱️ ±0s
 23 suites ±0     0 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit 22adf31. ± Comparison against base commit d3a5b3e.