feat: adapt authorization dialogs for multi-monitor setups

[Hureru]

Close #5

Summary by CodeRabbit

• New Features

  • Improved dialog window placement for multi-monitor setups; dialogs now center on the active monitor (or mouse display on Windows).

• Documentation

  • Updated architecture documentation to reflect enhanced window positioning and focus behavior for authorization dialogs.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: c0b88420-8d53-4d75-b5f7-8cbd60af25ba

📥 Commits

Reviewing files that changed from the base of the PR and between 406bbd2 and 8865c92.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (10)

• crates/sshwarden-ui/Cargo.toml
• crates/sshwarden-ui/src/bind_hosts/slint_dialog.rs
• crates/sshwarden-ui/src/lib.rs
• crates/sshwarden-ui/src/notify/slint_dialog.rs
• crates/sshwarden-ui/src/unlock/slint_dialog.rs
• crates/sshwarden-ui/src/window_placement.rs
• llmdoc/architecture/slint-authorization-dialog.md
• llmdoc/architecture/sshwarden-windows-hello-unlock.md
• llmdoc/index.md
• llmdoc/overview/project-overview.md

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📝 Walkthrough

Walkthrough

This PR implements multi-monitor dialog support by extracting window positioning logic into a dedicated utility module. The implementation detects the active monitor on Windows using cursor position and Win32 APIs, falls back to generic winit monitor selection, then centers dialogs within the selected monitor's bounds before focusing the window.

Changes

Multi-Monitor Dialog Placement

Layer / File(s)	Summary
Window placement utility implementation crates/sshwarden-ui/src/lib.rs, crates/sshwarden-ui/Cargo.toml, crates/sshwarden-ui/src/window_placement.rs	Introduce center_on_active_monitor_and_focus() entry point that attempts Windows-specific cursor-based active monitor detection using MONITORINFO and Win32 APIs, falls back to winit monitor selection (current, primary, or first available), and centers the dialog window using saturating arithmetic within the detected monitor bounds. The ScreenBounds struct validates monitor geometry with safe i32 conversions. Remove slint-center-win dependency and add Win32_Graphics_Gdi feature.
Dialog file integration crates/sshwarden-ui/src/bind_hosts/slint_dialog.rs, crates/sshwarden-ui/src/notify/slint_dialog.rs, crates/sshwarden-ui/src/unlock/slint_dialog.rs	Replace slint_center_win::center_window and manual winit window focus calls with crate::window_placement::center_on_active_monitor_and_focus() in all three dialog implementations.
Architecture and project documentation llmdoc/architecture/slint-authorization-dialog.md, llmdoc/architecture/sshwarden-windows-hello-unlock.md, llmdoc/overview/project-overview.md, llmdoc/index.md	Document the new window placement strategy describing Windows cursor-based active monitor detection with winit fallback, monitor work-area centering, and dialog focus behavior. Update project overview Tech Stack and Key Design Decisions sections. Add new documentation index query entry for multi-screen placement and synchronized update log entry.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

The PR introduces a sizable new utility module (145 lines) with platform-specific branching and Win32 API integration that requires careful review of bounds computation and monitor selection logic. The integration across three dialog files is straightforward and repetitive. Documentation updates are consistent and low-complexity, with one moderate-complexity architecture section describing the new flow.

Poem

🐰 From cursor's dance on multi-screens bright,
A dialog finds its rightful sight—
No more displaced to a distant pane,
Windows and fallbacks, a focused chain!
Centered at last, where the user can see,
This rabbit hops forward with UI glee! 🎪

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 61.54% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adapting authorization dialogs to work across multiple monitors, which is the core objective of this pull request.
Linked Issues check	✅ Passed	The pull request successfully implements multi-monitor support for authorization dialogs by introducing a new window_placement module that centers dialogs on the active monitor and provides appropriate fallback behavior.
Out of Scope Changes check	✅ Passed	All changes are directly related to implementing multi-monitor dialog placement: removing the old slint_center_win dependency, creating the new window_placement module, updating dialog centering logic across three dialog types, and documenting the architectural changes.

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✨ Finishing Touches

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• Create stacked PR
• Commit on current branch

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[Hureru]

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