Slightly widen top tabs and reduce in-page button widths

[plan3t]

Motivation

• The top tab row needed a bit more horizontal space to avoid crowding under Auto GUI scale.
• Action buttons on individual faction pages were visually wide compared to text fields and could look bulky at some scales.
• Map and member-area layout needed consistent scaling so controls align across GUI scales and a compact members/invites view was desirable.

Description

• Rebalanced tab sizing by increasing TAB_BUTTON_WIDTH, MIN_TAB_BUTTON_WIDTH, and TAB_BUTTON_GAP, and by centering using totalTabWidth = tabCount * tabButtonWidth + (tabCount - 1) * TAB_BUTTON_GAP; added compact tab labels via TAB_COMPACT_LABEL_THRESHOLD and FactionTab.getCompactLabel().
• Added panel scaling fields (panelContentWidth, horizontalScale), position helper panelX(int) and scaledWidth(int) to keep edit boxes scaled consistently and introduced scaledButtonWidth(int) to size buttons slightly smaller than fields.
• Switched per-page/action buttons (invites, permissions, member actions, rules, relations, bottom actions, and claim/map controls) from scaledWidth(...) to scaledButtonWidth(...) so buttons are narrower while inputs remain full-width.
• Added members/invites inline toggle UI with membersSectionButton and invitesSectionButton, layout helpers layoutMemberSectionButtons() and updateMemberSectionButtonState(), a MemberSection enum, and refactored visibility handling via setButtonVisible(...) and setEditBoxVisible(...).
• Tightened map footprint in FactionMapRenderer.buildMapRegion() by reducing max grid margins and lowering cellSize bounds so the map renders smaller and fits better at compact scales.

Testing

• Ran ./gradlew compileJava and the build completed successfully (BUILD SUCCESSFUL).

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Codex Task