Increase star density and reshape sea reflection to slanted inverted-trapezoid

[Heersin]

Motivation

• Make the hero night scene feel denser and more dynamic by adding subtle additional star points while preserving the pixel-night layered look.
• Change the sea reflection shape to a slanted inverted-trapezoid so the brightest lines are near the horizon and taper downward, matching the requested composition.

Description

• Added multiple radial-gradient entries to .sky-panel::before to increase star density while keeping original sizes and opacities.
• Added faint extra glow points to .sky-panel::after to maintain depth between star layers.
• Replaced the ASCII pattern in .sea-panel::after with a longer-top / shorter-bottom slanted inverted-trapezoid layout and reduced the skew from -11deg to -9deg for better visual alignment.
• All edits were made in assets/css/main.css under the .sky-panel and .sea-panel sections.

Testing

• Ran git diff --check which reported no whitespace or diff errors and passed.
• Rendered a snapshot using a Playwright script to produce artifacts/night-scene-updated.png to visually validate the denser stars and new reflection, and the script succeeded.
• Attempted hugo version to run a local site build but it failed because Hugo is not installed in the environment.

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Codex Task