feat: improve guided mode style

[jose-rZM]

Included (#84)

• Replaced the platform-dependent guided QWizard with a custom QDialog + QStackedWidget flow for full cross-platform visual and behavioral control.
• Redesigned the guided UI to better match the app.
• Added inline validation feedback inside each guided step instead of using wizard subtitles/header state.
• Add a progress bar.
• Disabled and visually dimmed the Guided mode and Finish buttons in SLRTableDialog while guided mode is open, and restored them when guided mode closes or completes.
• Add keyboard behavior so Enter advances to the next step.
• Added hand cursor behavior for clickable buttons.
• Align tests.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud