feat(cardwire-gui): Smart mode page

[luytan]

Description

Please include a summary of the changes and if applicable, a related issue.

If this PR introduce a new feature, explain your motivations

Fixes # (issue)

TODO

• Copy-Paste this line

Checklist:

• My code follows the style guidelines of this project (cargo fmt)
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the mdBook documentation
• My changes generate no new warnings (clippy/clang)
• New and existing unit tests pass locally with my changes (either use nix flake check or wait for the ci)

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between fd4df56 and 9eba39b.

⛔ Files ignored due to path filters (1)

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

📒 Files selected for processing (9)

• crates/cardwire-gui/Cargo.toml
• crates/cardwire-gui/src/app.rs
• crates/cardwire-gui/src/helpers/app_resolver.rs
• crates/cardwire-gui/src/helpers/dbus.rs
• crates/cardwire-gui/src/helpers/mod.rs
• crates/cardwire-gui/src/message.rs
• crates/cardwire-gui/src/models.rs
• crates/cardwire-gui/src/subscription.rs
• crates/cardwire-gui/src/ui.rs

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📝 Walkthrough

Summary by CodeRabbit

• New Features
  • Added a fully functional Smart Mode page for viewing and managing application GPU policies.
  • Added application search, policy refresh, loading indicators, and empty-state messaging.
  • Added application names and icons using desktop metadata for clearer identification.
  • Added policy toggles that are available when Smart Mode is active.
  • Added status notices for successful updates and errors.

Walkthrough

Smart Mode now loads application policies over D-Bus, resolves desktop metadata and icons, stores policy state, and renders searchable controls. Policy toggles update the D-Bus service only when Smart Mode is active.

Changes

Smart Mode application policy flow

Layer / File(s)	Summary
Policy models and message contracts crates/cardwire-gui/src/models.rs, crates/cardwire-gui/src/message.rs, crates/cardwire-gui/Cargo.toml	Adds D-Bus metadata, resolved application, and Smart Mode state models. Adds messages for policy loading, updates, searching, and refreshing.
Application metadata resolution crates/cardwire-gui/src/helpers/app_resolver.rs, crates/cardwire-gui/src/helpers/mod.rs	Discovers XDG data directories, reads localized .desktop files, applies name fallbacks, and resolves PNG, SVG, and XPM icons.
D-Bus policy orchestration crates/cardwire-gui/src/helpers/dbus.rs, crates/cardwire-gui/src/subscription.rs, crates/cardwire-gui/src/app.rs	Adds D-Bus methods and subscriptions for fetching and setting application policies. App state resolves metadata, tracks loading state, updates policies, and reports results.
Smart Mode page crates/cardwire-gui/src/ui.rs, crates/cardwire-gui/src/app.rs	Replaces the placeholder with policy counts, search and refresh controls, loading and empty states, application cards, and conditional policy toggles.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Smart Mode UI
  participant AppState
  participant CardwireDbus
  participant Desktop Metadata
  Smart Mode UI->>AppState: RefreshSmartPolicies
  AppState->>CardwireDbus: GetAppPolicies
  CardwireDbus-->>AppState: Application policy metadata
  AppState->>Desktop Metadata: Resolve names and icons
  Desktop Metadata-->>AppState: ResolvedApp values
  AppState-->>Smart Mode UI: Render searchable policies
  Smart Mode UI->>AppState: SetAppPolicy
  AppState->>CardwireDbus: SetAppPolicy
  CardwireDbus-->>AppState: Policy result

Loading

Possibly related PRs

• OpenGamingCollective/cardwire#155: Provides the SmartPolicy D-Bus interface used to fetch and set application GPU policies.
• OpenGamingCollective/cardwire#162: Introduces application metadata and policy APIs used by this Smart Mode implementation.
• OpenGamingCollective/cardwire#163: Renames the SmartInterface::set_app_policy method used for policy updates.

Suggested reviewers: juandelpueblo

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