[Lint] Convert URIs to strings using toUri()

[rfc2822]

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[Copilot]

Pull Request Overview

This PR applies a lint upgrade to convert URI parsing to use the .toUri() extension for improved consistency and readability.

• Replaced multiple instances of Uri.parse() with string literals followed by .toUri()
• Updated relevant import statements to use androidx.core.net.toUri across various UI, sync, and network modules

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
app/src/main/kotlin/at/bitfire/davdroid/ui/intro/BatteryOptimizationsPage.kt	Replaces Uri.parse() with .toUri() for battery optimizations intent.
app/src/main/kotlin/at/bitfire/davdroid/ui/account/AccountScreen.kt	Converts Uri.parse() to .toUri() and updates import accordingly.
app/src/main/kotlin/at/bitfire/davdroid/ui/TasksScreen.kt	Uses .toUri() on market intent strings to improve consistency.
app/src/main/kotlin/at/bitfire/davdroid/ui/AppSettingsActivity.kt	Adjusts battery optimizations setting URI conversion to .toUri().
app/src/main/kotlin/at/bitfire/davdroid/ui/AccountsScreen.kt	Updates URI conversion to .toUri() for manage data saver intent.
app/src/main/kotlin/at/bitfire/davdroid/sync/TasksAppManager.kt	Changes market URI parsing to use .toUri() for app detail intents.
app/src/main/kotlin/at/bitfire/davdroid/sync/SyncNotificationManager.kt	Replaces URI.parse() with .toUri() for exception notification intent.
app/src/main/kotlin/at/bitfire/davdroid/network/GoogleLogin.kt	Converts multiple Uri.parse() calls to .toUri() on configuration URIs.