refactor: use resolve for paths

[olivermrose]

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[Copilot]

Pull request overview

This PR refactors path handling throughout the application to use SvelteKit's resolve function from $app/paths, ensuring proper path resolution that respects any configured base path.

Changes:

• Added resolve imports from $app/paths across 15 files
• Converted all hardcoded navigation paths to use resolve() for both goto() calls and href attributes
• Parameterized routes now use SvelteKit's route ID pattern with proper parameter interpolation

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/routes/settings/+page.svelte	Converted logout button navigation to use resolve()
src/routes/auth/logout/+page.svelte	Converted login redirect to use resolve()
src/routes/auth/login/+page.svelte	Converted home page redirect to use resolve()
src/routes/(main)/whispers/+page.svelte	Converted whisper detail link to use parameterized resolve()
src/routes/(main)/channels/split/SplitHeader.svelte	Converted channel navigation and home redirect to use resolve()
src/routes/(main)/channels/+layout.svelte	Converted home redirect to use resolve()
src/routes/(main)/+page.svelte	Converted split view and channel navigation to use resolve()
src/routes/(main)/+layout.svelte	Converted settings navigation to use resolve()
src/lib/split-layout.ts	Converted split view activation to use resolve()
src/lib/menus/channel-menu.ts	Converted channel join, leave, and split navigation to use resolve()
src/lib/components/TitleBar.svelte	Converted settings and user channel navigation to use resolve()
src/lib/components/StreamTooltip.svelte	Converted channel link to use parameterized resolve()
src/lib/components/Sidebar.svelte	Converted whispers and split view navigation to use resolve()
src/lib/components/JoinDialog.svelte	Converted channel join navigation to use parameterized resolve()
src/lib/commands/built-in/leave.ts	Converted home redirect to use resolve()
src/lib/commands/built-in/join.ts	Converted channel join navigation to use parameterized resolve()

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