fix: simple ESLint errors — regex, unused vars, unused expressions

- eslint.config.js: ignore coverage/ directory (generated files)
- frontmatter.ts: no-regex-spaces — use {2} instead of literal spaces
- wikilinks.ts: no-useless-escape — remove unnecessary \[ escape
- ai-chat.ts: remove unused _model param from getContextLimit
- noteListHelpers.ts: remove unused _modifiedFiles param from filterEntries
- NoteList.tsx: replace ternary expression statement with if/else
- useTabManagement.ts: remove stale eslint-disable-next-line comment

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/utils/ai-chat.ts

@@ -25,7 +25,7 @@ export function estimateTokens(text: string | number): number {
 
 const DEFAULT_CONTEXT_LIMIT = 180_000
 
-export function getContextLimit(_model: string): number {
+export function getContextLimit(): number {
   return DEFAULT_CONTEXT_LIMIT
 }
 
@@ -41,7 +41,7 @@ export function buildSystemPrompt(
     return { prompt: '', totalTokens: 0, truncated: false }
   }
 
-  const contextBudget = Math.floor(getContextLimit(model) * 0.6)
+  const contextBudget = Math.floor(getContextLimit() * 0.6)
   const preamble = [
     'You are a helpful AI assistant integrated into Laputa, a personal knowledge management app.',
     'The user has selected the following notes as context. Use them to answer questions accurately.',

src/utils/frontmatter.ts

@@ -40,7 +40,7 @@ export function parseFrontmatter(content: string | null): ParsedFrontmatter {
   let inList = false
 
   for (const line of match[1].split('\n')) {
-    const listMatch = line.match(/^  - (.*)$/)
+    const listMatch = line.match(/^ {2}- (.*)$/)
     if (listMatch && currentKey) {
       inList = true
       currentList.push(unquote(listMatch[1]))

src/utils/noteListHelpers.ts

@@ -1,4 +1,4 @@
-import type { VaultEntry, SidebarSelection, ModifiedFile } from '../types'
+import type { VaultEntry, SidebarSelection } from '../types'
 
 export interface RelationshipGroup {
   label: string
@@ -196,6 +196,6 @@ function filterByFilterType(entries: VaultEntry[], filter: string): VaultEntry[]
   return []
 }
 
-export function filterEntries(entries: VaultEntry[], selection: SidebarSelection, _modifiedFiles?: ModifiedFile[]): VaultEntry[] {
+export function filterEntries(entries: VaultEntry[], selection: SidebarSelection): VaultEntry[] {
   return filterByKind(entries, selection)
 }

src/utils/wikilinks.ts

@@ -62,7 +62,7 @@ export function splitFrontmatter(content: string): [string, string] {
 
 export function countWords(content: string): number {
   const [, body] = splitFrontmatter(content)
-  const text = body.replace(/[#*_\[\]`>~\-|]/g, '').trim()
+  const text = body.replace(/[#*_[\]`>~\-|]/g, '').trim()
   if (!text) return 0
   return text.split(/\s+/).filter(Boolean).length
 }