fix: refuse 0,0,0 and duplicate colours for realms

[ryanbarlow97]

Cult of Erandor's leader set the realm colour to 0,0,0. The web map reads land without an owner as 0,0,0, so hovering any unclaimed land highlighted Cult of Erandor, and the realm's own province was drawn as empty and could not be picked. ProvinceSystem #232 stops the site treating empty land as black; this stops the colour being chosen.

FactionManager.validateRGB returns a new code 4 for 0,0,0 (in any spelling, such as 0, 0, 00), and both /faction setcolour and /guild setcolour explain that it is reserved for unclaimed land. The title admin colour command refuses it too.

/faction setcolour also had no uniqueness check, unlike /guild setcolour. Two realms sharing a colour share a pick colour on the map, so it now refuses a colour another realm or guild already uses.

Cult of Erandor still holds 0,0,0 until its leader or staff picks another colour.

Tests: mvn clean verify (8,163+ tests), with new cases for the reserved colour, the title command and the realm uniqueness check.

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⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 7848395e-e156-4b8e-858e-88464e2832d5

📥 Commits

Reviewing files that changed from the base of the PR and between 3fbcb94 and f1e36ba.

📒 Files selected for processing: 3

• src/main/java/net/tfminecraft/simplefactions/managers/CommandManager.java
• src/main/java/net/tfminecraft/simplefactions/utils/RandomRGB.java
• src/test/java/net/tfminecraft/simplefactions/utils/SharedDomainUtilitiesCoverageTest.java

📝 Summary

Summary by CodeRabbit

• Bug Fixes
  • Reserved 0,0,0 for unclaimed land; guild, faction and title colour settings now reject it.
  • Faction colour changes are rejected when the colour is already in use, leaving the existing colour unchanged.

RGB validation now rejects 0,0,0 as reserved for unclaimed land. Guild, faction, and title colour commands report this validation error. Faction colour changes also reject colours already used by another faction.

Changes: Colour validation and assignment

Layer / File(s)	Summary
Reject the reserved RGB value src/main/java/net/tfminecraft/simplefactions/managers/FactionManager.java, src/main/java/net/tfminecraft/simplefactions/tiers/admin/TitleAdminService.java, src/main/java/net/tfminecraft/simplefactions/managers/CommandManager.java, src/test/java/net/tfminecraft/simplefactions/managers/FactionManagerCoverageTest.java, src/test/java/net/tfminecraft/simplefactions/managers/CommandManagerCoverageTest.java, src/test/java/net/tfminecraft/simplefactions/tiers/admin/TitleAdminServiceTest.java	validateRGB returns error code 4 for 0,0,0. Colour commands report the reserved-colour message. Tests cover the validation result and rejected title colour.
Reject faction colour conflicts src/main/java/net/tfminecraft/simplefactions/managers/CommandManager.java, src/test/java/net/tfminecraft/simplefactions/managers/CommandManagerCoverageTest.java	The faction colour command rejects a valid colour already used by another faction, except when it matches the current colour. A test checks that rejection leaves the faction colour unchanged.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Suggested reviewers: xxfran10xx

Merge Risk: 🔵 Low · up to 3fbcb

Faction leaders can use equivalent numeric formatting, such as a leading zero, to assign a colour already used by another realm. This is a narrow, avoidable case; the PR is otherwise mergeable, but comparing numeric RGB components would fully enforce uniqueness.

- [ ] Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at
@src/main/java/net/tfminecraft/simplefactions/managers/CommandManager.java:
- Around line 844-845: Update the RGB uniqueness checks in RandomRGB.isFree and
the CommandManager condition to compare parsed numeric components rather than
raw strings. Apply the same comparison to the candidate, current faction colour,
and stored faction and guild colours so equivalent spellings such as
leading-zero components are treated as identical.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: de0fd2fa-073d-4f49-85f0-e82491a7270f

📥 Commits

Reviewing files that changed from the base of the PR and between 8f62813 and 3fbcb94.

📒 Files selected for processing: 6

• src/main/java/net/tfminecraft/simplefactions/managers/CommandManager.java
• src/main/java/net/tfminecraft/simplefactions/managers/FactionManager.java
• src/main/java/net/tfminecraft/simplefactions/tiers/admin/TitleAdminService.java
• src/test/java/net/tfminecraft/simplefactions/managers/CommandManagerCoverageTest.java
• src/test/java/net/tfminecraft/simplefactions/managers/FactionManagerCoverageTest.java
• src/test/java/net/tfminecraft/simplefactions/tiers/admin/TitleAdminServiceTest.java

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[ryanbarlow97]

Fixed in f1e36ba: RandomRGB.sameRGB compares colours by value, used by isFree and both setcolour commands. mvn clean verify passes (8,164 tests, coverage gate met).