Add Electron scene triggers and expand pre-meeting automation flow

[sircharlo]

Motivation

• Provide a deterministic, external trigger path so an Electron app or shortcut can run the exact automation sequence (pre/post and just-before-start) on demand without waiting for the scheduler.
• Bring the automation flows closer to the requested behavior (mute/unmute rules, host feed state, participant panel, window snapping, gallery view, and a spotlight hook).
• Add safe scaffolding for operations that require more robust UI locators (spotlight) so the flow is stable while allowing later refinement.

Description

• Added command-line scene handling in ZoomMate.au3 to support --scene prepost and --scene prestart and exit after executing the scene.
• Added RunAutomationScene() in Includes/MeetingAutomation.au3 to dispatch prepost → _SetPreAndPostMeetingSettings() and prestart → _SetDuringMeetingSettings() and to validate unknown scenes.
• Expanded the two automation flows in Includes/MeetingAutomation.au3 to call EnsureGalleryView(), pulse a spotlight hook (PulseSpotlightHostVideo()), open the participants panel, and snap the Zoom window to the configured side.
• Implemented two best-effort helper functions in Includes/Settings.au3: EnsureGalleryView() (sends Alt+F2 as a lightweight gallery-view attempt) and PulseSpotlightHostVideo() (safe placeholder that logs and waits until a reliable UIA selector is implemented).
• Documented the new Electron integration usage and scene semantics in README.md.

Testing

• Ran a static check via git diff --check with no whitespace or index issues (passed).
• Verified presence/absence of AutoIt runtime in this environment using which autoit3 || which AutoIt3 which showed the runtime is not available here (environment limitation).
• Performed local file edits and textual replacements and validated modified files (Includes/MeetingAutomation.au3, Includes/Settings.au3, ZoomMate.au3, README.md) updated without syntax conflicts in this workspace.

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